2155872257 has 12 divisors (see below), whose sum is σ = 2735838576. Its totient is φ = 1679900040.

The previous prime is 2155872233. The next prime is 2155872283. The reversal of 2155872257 is 7522785512.

It is not a de Polignac number, because 2155872257 - 2⁶ = 2155872193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155872217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1999343 + ... + 2000420.

It is an arithmetic number, because the mean of its divisors is an integer number (227986548).

It is a Proth number, since it is equal to 257 ⋅ 2²³ + 1 and 257 < 2²³.

Almost surely, 2^2155872257 is an apocalyptic number.

It is an amenable number.

2155872257 is a deficient number, since it is larger than the sum of its proper divisors (579966319).

2155872257 is a wasteful number, since it uses less digits than its factorization.

2155872257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999788 (or 3999781 counting only the distinct ones).

The product of its digits is 392000, while the sum is 44.

The square root of 2155872257 is about 46431.3714744676. The cubic root of 2155872257 is about 1291.8368673969.

The spelling of 2155872257 in words is "two billion, one hundred fifty-five million, eight hundred seventy-two thousand, two hundred fifty-seven".