2157551536 has 120 divisors (see below), whose sum is σ = 5148472560. Its totient is φ = 870912000.

The previous prime is 2157551533. The next prime is 2157551563. The reversal of 2157551536 is 6351557512.

It is not an unprimeable number, because it can be changed into a prime (2157551533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3589636 + ... + 3590236.

It is an arithmetic number, because the mean of its divisors is an integer number (42903938).

Almost surely, 2^2157551536 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 2157551536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2574236280).

2157551536 is an abundant number, since it is smaller than the sum of its proper divisors (2990921024).

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

2157551536 is a wasteful number, since it uses less digits than its factorization.

2157551536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 870 counting only the distinct ones).

The product of its digits is 157500, while the sum is 40.

The square root of 2157551536 is about 46449.4514068789. The cubic root of 2157551536 is about 1292.1721982588.

The spelling of 2157551536 in words is "two billion, one hundred fifty-seven million, five hundred fifty-one thousand, five hundred thirty-six".