7818628184761 has 3 divisors (see below), whose sum is σ = 7818630980943. Its totient is φ = 7818625388580.

The previous prime is 7818628184743. The next prime is 7818628184767. The reversal of 7818628184761 is 1674818268187.

The square root of 7818628184761 is 2796181.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2702798472361 + 5115829712400 = 1644019^2 + 2261820^2 .

It is not a de Polignac number, because 7818628184761 - 2⁵ = 7818628184729 is a prime.

It is a super-2 number, since 2×7818628184761² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7818628184767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1398091 + ... + 4194271.

It is an arithmetic number, because the mean of its divisors is an integer number (2606210326981).

Almost surely, 2^{7818628184761} is an apocalyptic number.

7818628184761 is the 2796181-st square number.

7818628184761 is the 1398091-st centered octagonal number.

It is an amenable number.

7818628184761 is a deficient number, since it is larger than the sum of its proper divisors (2796182).

7818628184761 is an frugal number, since it uses more digits than its factorization.

7818628184761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592362 (or 2796181 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 67.

The spelling of 7818628184761 in words is "seven trillion, eight hundred eighteen billion, six hundred twenty-eight million, one hundred eighty-four thousand, seven hundred sixty-one".