82815912621 has 32 divisors (see below), whose sum is σ = 132185329920. Its totient is φ = 50941507392.

The previous prime is 82815912601. The next prime is 82815912629. The reversal of 82815912621 is 12621951828.

82815912621 is a `hidden beast` number, since 8 + 2 + 8 + 1 + 5 + 9 + 12 + 621 = 666.

It is not a de Polignac number, because 82815912621 - 2¹³ = 82815904429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82815912629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 777256 + ... + 877358.

It is an arithmetic number, because the mean of its divisors is an integer number (4130791560).

Almost surely, 2^82815912621 is an apocalyptic number.

It is an amenable number.

82815912621 is a deficient number, since it is larger than the sum of its proper divisors (49369417299).

82815912621 is a wasteful number, since it uses less digits than its factorization.

82815912621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102482 (or 102476 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The spelling of 82815912621 in words is "eighty-two billion, eight hundred fifteen million, nine hundred twelve thousand, six hundred twenty-one".