81382396176 has 45 divisors (see below), whose sum is σ = 227767259109. Its totient is φ = 27126324288.

The previous prime is 81382396111. The next prime is 81382396181. The reversal of 81382396176 is 67169328318.

The square root of 81382396176 is 285276.

It is a perfect power (a square), and thus also a powerful number.

81382396176 is a `hidden beast` number, since 8 + 1 + 3 + 82 + 396 + 176 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19393347600 + 61989048576 = 139260^2 + 248976^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3411426 + ... + 3435198.

Almost surely, 2^81382396176 is an apocalyptic number.

81382396176 is the 285276-th square number.

It is an amenable number.

81382396176 is an abundant number, since it is smaller than the sum of its proper divisors (146384862933).

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

81382396176 is an frugal number, since it uses more digits than its factorization.

81382396176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47560 (or 23778 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 81382396176 in words is "eighty-one billion, three hundred eighty-two million, three hundred ninety-six thousand, one hundred seventy-six".