82191857672 has 16 divisors (see below), whose sum is σ = 154285470060. Its totient is φ = 41049065664.

The previous prime is 82191857659. The next prime is 82191857701. The reversal of 82191857672 is 27675819128.

It can be written as a sum of positive squares in 2 ways, for example, as 63860322436 + 18331535236 = 252706^2 + 135394^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5850443 + ... + 5864474.

Almost surely, 2^82191857672 is an apocalyptic number.

It is an amenable number.

82191857672 is a deficient number, since it is larger than the sum of its proper divisors (72093612388).

82191857672 is a wasteful number, since it uses less digits than its factorization.

82191857672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11715800 (or 11715796 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 82191857672 in words is "eighty-two billion, one hundred ninety-one million, eight hundred fifty-seven thousand, six hundred seventy-two".