2156571862 has 64 divisors (see below), whose sum is σ = 3601889280. Its totient is φ = 965188224.

The previous prime is 2156571847. The next prime is 2156571869. The reversal of 2156571862 is 2681756512.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156571869) 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 31 ways as a sum of consecutive naturals, for example, 5781508 + ... + 5781880.

It is an arithmetic number, because the mean of its divisors is an integer number (56279520).

Almost surely, 2^2156571862 is an apocalyptic number.

2156571862 is a deficient number, since it is larger than the sum of its proper divisors (1445317418).

2156571862 is a wasteful number, since it uses less digits than its factorization.

2156571862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its digits is 201600, while the sum is 43.

The square root of 2156571862 is about 46438.9046167112. The cubic root of 2156571862 is about 1291.9765908560.

The spelling of 2156571862 in words is "two billion, one hundred fifty-six million, five hundred seventy-one thousand, eight hundred sixty-two".