81590113522468 has 24 divisors (see below), whose sum is σ = 142825097768192. Its totient is φ = 40782943373184.

The previous prime is 81590113522427. The next prime is 81590113522471. The reversal of 81590113522468 is 86422531109518.

It is a happy number.

It is a super-2 number, since 2×81590113522468² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783616780 + ... + 783720892.

Almost surely, 2^{81590113522468} is an apocalyptic number.

It is an amenable number.

81590113522468 is a deficient number, since it is larger than the sum of its proper divisors (61234984245724).

81590113522468 is a wasteful number, since it uses less digits than its factorization.

81590113522468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160411 (or 160409 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 81590113522468 in words is "eighty-one trillion, five hundred ninety billion, one hundred thirteen million, five hundred twenty-two thousand, four hundred sixty-eight".