2157773568 has 72 divisors (see below), whose sum is σ = 5768372400. Its totient is φ = 716058624.

The previous prime is 2157773549. The next prime is 2157773587. The reversal of 2157773568 is 8653777512.

It is an interprime number because it is at equal distance from previous prime (2157773549) and next prime (2157773587).

It is a self number, because there is not a number n which added to its sum of digits gives 2157773568.

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, 169738 + ... + 182006.

Almost surely, 2^2157773568 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 2157773568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2884186200).

2157773568 is an abundant number, since it is smaller than the sum of its proper divisors (3610598832).

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

2157773568 is a wasteful number, since it uses less digits than its factorization.

2157773568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12517 (or 12503 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 51.

The square root of 2157773568 is about 46451.8413843843. The cubic root of 2157773568 is about 1292.2165222269.

The spelling of 2157773568 in words is "two billion, one hundred fifty-seven million, seven hundred seventy-three thousand, five hundred sixty-eight".