2156647568 has 10 divisors (see below), whose sum is σ = 4178504694. Its totient is φ = 1078323776.

The previous prime is 2156647567. The next prime is 2156647607. The reversal of 2156647568 is 8657466512.

It can be written as a sum of positive squares in only one way, i.e., 1835951104 + 320696464 = 42848^2 + 17908^2 .

It is a super-2 number, since 2×2156647568² = 9302257465120629248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2156647567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67395221 + ... + 67395252.

Almost surely, 2^2156647568 is an apocalyptic number.

It is an amenable number.

2156647568 is a deficient number, since it is larger than the sum of its proper divisors (2021857126).

2156647568 is a wasteful number, since it uses less digits than its factorization.

2156647568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134790481 (or 134790475 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The square root of 2156647568 is about 46439.7197235298. The cubic root of 2156647568 is about 1291.9917088676.

The spelling of 2156647568 in words is "two billion, one hundred fifty-six million, six hundred forty-seven thousand, five hundred sixty-eight".