81925836505502 has 64 divisors (see below), whose sum is σ = 138309630375168. Its totient is φ = 36068004000000.

The previous prime is 81925836505501. The next prime is 81925836505547. The reversal of 81925836505502 is 20550563852918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81925836505501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 367858193 + ... + 368080835.

It is an arithmetic number, because the mean of its divisors is an integer number (2161087974612).

Almost surely, 2^{81925836505502} is an apocalyptic number.

81925836505502 is a deficient number, since it is larger than the sum of its proper divisors (56383793869666).

81925836505502 is a wasteful number, since it uses less digits than its factorization.

81925836505502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224745.

The product of its (nonzero) digits is 25920000, while the sum is 59.

The spelling of 81925836505502 in words is "eighty-one trillion, nine hundred twenty-five billion, eight hundred thirty-six million, five hundred five thousand, five hundred two".