81562026518 has 16 divisors (see below), whose sum is σ = 145899774720. Its totient is φ = 33435364776.

The previous prime is 81562026439. The next prime is 81562026613.

81562026518 is nontrivially palindromic in base 10.

It is a congruent number.

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, 126648788 + ... + 126649431.

It is an arithmetic number, because the mean of its divisors is an integer number (9118735920).

Almost surely, 2^81562026518 is an apocalyptic number.

81562026518 is a deficient number, since it is larger than the sum of its proper divisors (64337748202).

81562026518 is a wasteful number, since it uses less digits than its factorization.

81562026518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253298251.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 81562026518 in words is "eighty-one billion, five hundred sixty-two million, twenty-six thousand, five hundred eighteen".