81925018698 has 16 divisors (see below), whose sum is σ = 163899623520. Its totient is φ = 27300075216.

The previous prime is 81925018627. The next prime is 81925018723. The reversal of 81925018698 is 89681052918.

It is a Curzon 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, 2044593 + ... + 2084276.

It is an arithmetic number, because the mean of its divisors is an integer number (10243726470).

Almost surely, 2^81925018698 is an apocalyptic number.

81925018698 is an abundant number, since it is smaller than the sum of its proper divisors (81974604822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81925018698 is a wasteful number, since it uses less digits than its factorization.

81925018698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132181.

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 81925018698 in words is "eighty-one billion, nine hundred twenty-five million, eighteen thousand, six hundred ninety-eight".