7666578481 has 3 divisors (see below), whose sum is σ = 7666666041. Its totient is φ = 7666490922.

The previous prime is 7666578461. The next prime is 7666578487. The reversal of 7666578481 is 1848756667.

It is a happy number.

The square root of 7666578481 is 87559.

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 is not a de Polignac number, because 7666578481 - 2⁵ = 7666578449 is a prime.

It is a super-2 number, since 2×7666578481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7666578487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 43780 + ... + 131338.

It is an arithmetic number, because the mean of its divisors is an integer number (2555555347).

Almost surely, 2^7666578481 is an apocalyptic number.

7666578481 is the 87559-th square number.

7666578481 is the 43780-th centered octagonal number.

It is an amenable number.

7666578481 is a deficient number, since it is larger than the sum of its proper divisors (87560).

7666578481 is an frugal number, since it uses more digits than its factorization.

7666578481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175118 (or 87559 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The cubic root of 7666578481 is about 1971.8196729046.

The spelling of 7666578481 in words is "seven billion, six hundred sixty-six million, five hundred seventy-eight thousand, four hundred eighty-one".