2156851632 has 160 divisors (see below), whose sum is σ = 6164605440. Its totient is φ = 645765120.

The previous prime is 2156851559. The next prime is 2156851637. The reversal of 2156851632 is 2361586512.

It is a super-2 number, since 2×2156851632² = 9304017924922126848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (2156851637) 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, 3942783 + ... + 3943329.

It is an arithmetic number, because the mean of its divisors is an integer number (38528784).

Almost surely, 2^2156851632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156851632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3082302720).

2156851632 is an abundant number, since it is smaller than the sum of its proper divisors (4007753808).

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

2156851632 is a wasteful number, since it uses less digits than its factorization.

2156851632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 725 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 2156851632 is about 46441.9167563097. The cubic root of 2156851632 is about 1292.0324574017.

The spelling of 2156851632 in words is "two billion, one hundred fifty-six million, eight hundred fifty-one thousand, six hundred thirty-two".