81909622319904 has 120 divisors (see below), whose sum is σ = 240916664596608. Its totient is φ = 27300629992320.

The previous prime is 81909622319879. The next prime is 81909622319927. The reversal of 81909622319904 is 40991322690918.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26069289 + ... + 29041815.

Almost surely, 2^{81909622319904} is an apocalyptic number.

It is an amenable number.

81909622319904 is an abundant number, since it is smaller than the sum of its proper divisors (159007042276704).

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

81909622319904 is a wasteful number, since it uses less digits than its factorization.

81909622319904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983180 (or 2983163 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 81909622319904 in words is "eighty-one trillion, nine hundred nine billion, six hundred twenty-two million, three hundred nineteen thousand, nine hundred four".