81008252505586 has 32 divisors (see below), whose sum is σ = 152110540794240. Its totient is φ = 31548852900096.

The previous prime is 81008252505577. The next prime is 81008252505611. The reversal of 81008252505586 is 68550525280018.

It is a super-2 number, since 2×81008252505586² (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 15 ways as a sum of consecutive naturals, for example, 5868455320 + ... + 5868469123.

It is an arithmetic number, because the mean of its divisors is an integer number (4753454399820).

Almost surely, 2^{81008252505586} is an apocalyptic number.

81008252505586 is a deficient number, since it is larger than the sum of its proper divisors (71102288288654).

81008252505586 is a wasteful number, since it uses less digits than its factorization.

81008252505586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736924498.

The product of its (nonzero) digits is 7680000, while the sum is 55.

The spelling of 81008252505586 in words is "eighty-one trillion, eight billion, two hundred fifty-two million, five hundred five thousand, five hundred eighty-six".