82157672065 has 24 divisors (see below), whose sum is σ = 114749350272. Its totient is φ = 56305277280.

The previous prime is 82157672033. The next prime is 82157672089. The reversal of 82157672065 is 56027675128.

It is a happy number.

It is not a de Polignac number, because 82157672065 - 2⁵ = 82157672033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

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, 351112 + ... + 536278.

It is an arithmetic number, because the mean of its divisors is an integer number (4781222928).

Almost surely, 2^82157672065 is an apocalyptic number.

It is an amenable number.

82157672065 is a deficient number, since it is larger than the sum of its proper divisors (32591678207).

82157672065 is a wasteful number, since it uses less digits than its factorization.

82157672065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186997 (or 186990 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 82157672065 in words is "eighty-two billion, one hundred fifty-seven million, six hundred seventy-two thousand, sixty-five".