81526502765 has 16 divisors (see below), whose sum is σ = 102209821056. Its totient is φ = 62309438400.

The previous prime is 81526502731. The next prime is 81526502779. The reversal of 81526502765 is 56720562518.

It is not a de Polignac number, because 81526502765 - 2⁸ = 81526502509 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 337331 + ... + 526160.

It is an arithmetic number, because the mean of its divisors is an integer number (6388113816).

Almost surely, 2^81526502765 is an apocalyptic number.

It is an amenable number.

81526502765 is a deficient number, since it is larger than the sum of its proper divisors (20683318291).

81526502765 is a wasteful number, since it uses less digits than its factorization.

81526502765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864340.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 81526502765 in words is "eighty-one billion, five hundred twenty-six million, five hundred two thousand, seven hundred sixty-five".