2156801964 has 24 divisors (see below), whose sum is σ = 5053601280. Its totient is φ = 715924944.

The previous prime is 2156801957. The next prime is 2156801993. The reversal of 2156801964 is 4691086512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373144 + ... + 378879.

It is an arithmetic number, because the mean of its divisors is an integer number (210566720).

Almost surely, 2^2156801964 is an apocalyptic number.

It is an amenable number.

2156801964 is an abundant number, since it is smaller than the sum of its proper divisors (2896799316).

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

2156801964 is a wasteful number, since it uses less digits than its factorization.

2156801964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752269 (or 752267 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 2156801964 is about 46441.3820207797. The cubic root of 2156801964 is about 1292.0225396803.

The spelling of 2156801964 in words is "two billion, one hundred fifty-six million, eight hundred one thousand, nine hundred sixty-four".