7875566681 has 4 divisors (see below), whose sum is σ = 7876571364. Its totient is φ = 7874562000.

The previous prime is 7875566669. The next prime is 7875566701. The reversal of 7875566681 is 1866655787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2173051456 + 5702515225 = 46616^2 + 75515^2 .

It is a cyclic number.

It is not a de Polignac number, because 7875566681 - 2¹⁴ = 7875550297 is a prime.

It is a super-2 number, since 2×7875566681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7875566681.

It is not an unprimeable number, because it can be changed into a prime (7875566381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490490 + ... + 506291.

It is an arithmetic number, because the mean of its divisors is an integer number (1969142841).

Almost surely, 2^7875566681 is an apocalyptic number.

It is an amenable number.

7875566681 is a deficient number, since it is larger than the sum of its proper divisors (1004683).

7875566681 is an equidigital number, since it uses as much as digits as its factorization.

7875566681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004682.

The product of its digits is 16934400, while the sum is 59.

The square root of 7875566681 is about 88744.3895747782. The cubic root of 7875566681 is about 1989.5763246262.

The spelling of 7875566681 in words is "seven billion, eight hundred seventy-five million, five hundred sixty-six thousand, six hundred eighty-one".