7925751635681 has 4 divisors (see below), whose sum is σ = 8646274511664. Its totient is φ = 7205228759700.

The previous prime is 7925751635621. The next prime is 7925751635717. The reversal of 7925751635681 is 1865361575297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7925751635681 - 2²⁶ = 7925684526817 is a prime.

It is a super-2 number, since 2×7925751635681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7925751635611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360261437975 + ... + 360261437996.

It is an arithmetic number, because the mean of its divisors is an integer number (2161568627916).

Almost surely, 2^{7925751635681} is an apocalyptic number.

It is an amenable number.

7925751635681 is a deficient number, since it is larger than the sum of its proper divisors (720522875983).

7925751635681 is a wasteful number, since it uses less digits than its factorization.

7925751635681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720522875982.

The product of its digits is 95256000, while the sum is 65.

The spelling of 7925751635681 in words is "seven trillion, nine hundred twenty-five billion, seven hundred fifty-one million, six hundred thirty-five thousand, six hundred eighty-one".