2156201670 has 64 divisors (see below), whose sum is σ = 5921533440. Its totient is φ = 492231168.

The previous prime is 2156201659. The next prime is 2156201687. The reversal of 2156201670 is 761026512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174414 + ... + 186366.

It is an arithmetic number, because the mean of its divisors is an integer number (92523960).

Almost surely, 2^2156201670 is an apocalyptic number.

2156201670 is an abundant number, since it is smaller than the sum of its proper divisors (3765331770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156201670 is a wasteful number, since it uses less digits than its factorization.

2156201670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12829.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 2156201670 is about 46434.9186496542. The cubic root of 2156201670 is about 1291.9026607487.

The spelling of 2156201670 in words is "two billion, one hundred fifty-six million, two hundred one thousand, six hundred seventy".