82172431865 has 16 divisors (see below), whose sum is σ = 104084325120. Its totient is φ = 62278027632.

The previous prime is 82172431843. The next prime is 82172431877. The reversal of 82172431865 is 56813427128.

It is not a de Polignac number, because 82172431865 - 2⁶ = 82172431801 is a prime.

It is a super-3 number, since 3×82172431865³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1163729 + ... + 1232318.

It is an arithmetic number, because the mean of its divisors is an integer number (6505270320).

Almost surely, 2^82172431865 is an apocalyptic number.

It is an amenable number.

82172431865 is a deficient number, since it is larger than the sum of its proper divisors (21911893255).

82172431865 is an equidigital number, since it uses as much as digits as its factorization.

82172431865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396109 (or 2396071 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The spelling of 82172431865 in words is "eighty-two billion, one hundred seventy-two million, four hundred thirty-one thousand, eight hundred sixty-five".