2156851633 has 4 divisors (see below), whose sum is σ = 2270370160. Its totient is φ = 2043333108.

The previous prime is 2156851559. The next prime is 2156851637. The reversal of 2156851633 is 3361586512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2156851633 - 2⁹ = 2156851121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156851637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56759235 + ... + 56759272.

It is an arithmetic number, because the mean of its divisors is an integer number (567592540).

Almost surely, 2^2156851633 is an apocalyptic number.

It is an amenable number.

2156851633 is a deficient number, since it is larger than the sum of its proper divisors (113518527).

2156851633 is a wasteful number, since it uses less digits than its factorization.

2156851633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113518526.

The product of its digits is 129600, while the sum is 40.

The square root of 2156851633 is about 46441.9167670758. The cubic root of 2156851633 is about 1292.0324576014.

The spelling of 2156851633 in words is "two billion, one hundred fifty-six million, eight hundred fifty-one thousand, six hundred thirty-three".