2157556326 has 64 divisors (see below), whose sum is σ = 4739083200. Its totient is φ = 651800576.

The previous prime is 2157556319. The next prime is 2157556327. The reversal of 2157556326 is 6236557512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157556327) 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, 1504906 + ... + 1506338.

It is an arithmetic number, because the mean of its divisors is an integer number (74048175).

Almost surely, 2^2157556326 is an apocalyptic number.

2157556326 is an abundant number, since it is smaller than the sum of its proper divisors (2581526874).

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

2157556326 is a wasteful number, since it uses less digits than its factorization.

2157556326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its digits is 378000, while the sum is 42.

The square root of 2157556326 is about 46449.5029682773. The cubic root of 2157556326 is about 1292.1731545125.

The spelling of 2157556326 in words is "two billion, one hundred fifty-seven million, five hundred fifty-six thousand, three hundred twenty-six".