81962759976384 has 56 divisors (see below), whose sum is σ = 247839774218368. Its totient is φ = 23417931421440.

The previous prime is 81962759976373. The next prime is 81962759976407. The reversal of 81962759976384 is 48367995726918.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (84).

It is a junction number, because it is equal to n+sod(n) for n = 81962759976297 and 81962759976306.

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, 30492096862 + ... + 30492099549.

Almost surely, 2^{81962759976384} is an apocalyptic number.

81962759976384 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81962759976384 is an abundant number, since it is smaller than the sum of its proper divisors (165877014241984).

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

81962759976384 is a wasteful number, since it uses less digits than its factorization.

81962759976384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60984196433 (or 60984196423 counting only the distinct ones).

The product of its digits is 9876142080, while the sum is 84.

The spelling of 81962759976384 in words is "eighty-one trillion, nine hundred sixty-two billion, seven hundred fifty-nine million, nine hundred seventy-six thousand, three hundred eighty-four".