81583997214384 has 120 divisors (see below), whose sum is σ = 261520450682400. Its totient is φ = 23257798631424.

The previous prime is 81583997214311. The next prime is 81583997214403. The reversal of 81583997214384 is 48341279938518.

81583997214384 is a `hidden beast` number, since 8 + 1 + 5 + 83 + 9 + 97 + 21 + 438 + 4 = 666.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89677147 + ... + 90582330.

It is an arithmetic number, because the mean of its divisors is an integer number (2179337089020).

Almost surely, 2^{81583997214384} is an apocalyptic number.

81583997214384 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81583997214384 is an abundant number, since it is smaller than the sum of its proper divisors (179936453468016).

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

81583997214384 is a wasteful number, since it uses less digits than its factorization.

81583997214384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180259947 (or 180259938 counting only the distinct ones).

The product of its digits is 418037760, while the sum is 72.

The spelling of 81583997214384 in words is "eighty-one trillion, five hundred eighty-three billion, nine hundred ninety-seven million, two hundred fourteen thousand, three hundred eighty-four".