82172431857 has 16 divisors (see below), whose sum is σ = 113372208000. Its totient is φ = 52878169344.

The previous prime is 82172431843. The next prime is 82172431877. The reversal of 82172431857 is 75813427128.

It is not a de Polignac number, because 82172431857 - 2³¹ = 80024948209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82172431877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196569 + ... + 450537.

It is an arithmetic number, because the mean of its divisors is an integer number (7085763000).

Almost surely, 2^82172431857 is an apocalyptic number.

82172431857 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

82172431857 is a deficient number, since it is larger than the sum of its proper divisors (31199776143).

82172431857 is a wasteful number, since it uses less digits than its factorization.

82172431857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257720.

The product of its digits is 752640, while the sum is 48.

The spelling of 82172431857 in words is "eighty-two billion, one hundred seventy-two million, four hundred thirty-one thousand, eight hundred fifty-seven".