7981157699256 has 128 divisors (see below), whose sum is σ = 23626407628800. Its totient is φ = 2198567715840.

The previous prime is 7981157699213. The next prime is 7981157699261. The reversal of 7981157699256 is 6529967511897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1447525 + ... + 4249428.

It is an arithmetic number, because the mean of its divisors is an integer number (184581309600).

Almost surely, 2^{7981157699256} is an apocalyptic number.

It is an amenable number.

7981157699256 is an abundant number, since it is smaller than the sum of its proper divisors (15645249929544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7981157699256 is a wasteful number, since it uses less digits than its factorization.

7981157699256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5697269 (or 5697265 counting only the distinct ones).

The product of its digits is 514382400, while the sum is 75.

The spelling of 7981157699256 in words is "seven trillion, nine hundred eighty-one billion, one hundred fifty-seven million, six hundred ninety-nine thousand, two hundred fifty-six".