2158971057 has 8 divisors (see below), whose sum is σ = 3198475680. Its totient is φ = 1439314020.

The previous prime is 2158971029. The next prime is 2158971079. The reversal of 2158971057 is 7501798512.

2158971057 is a `hidden beast` number, since 2 + 1 + 589 + 7 + 10 + 57 = 666.

It is not a de Polignac number, because 2158971057 - 2²² = 2154776753 is a prime.

It is a super-2 number, since 2×2158971057² = 9322312049927394498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2158973057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39980919 + ... + 39980972.

It is an arithmetic number, because the mean of its divisors is an integer number (399809460).

Almost surely, 2^2158971057 is an apocalyptic number.

2158971057 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2158971057 is a deficient number, since it is larger than the sum of its proper divisors (1039504623).

2158971057 is an equidigital number, since it uses as much as digits as its factorization.

2158971057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79961900 (or 79961894 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The square root of 2158971057 is about 46464.7291717061. The cubic root of 2158971057 is about 1292.4555230390.

The spelling of 2158971057 in words is "two billion, one hundred fifty-eight million, nine hundred seventy-one thousand, fifty-seven".