2156647567 has 2 divisors, whose sum is σ = 2156647568. Its totient is φ = 2156647566.

The previous prime is 2156647547. The next prime is 2156647607. The reversal of 2156647567 is 7657466512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156647567 - 2⁷ = 2156647439 is a prime.

It is a super-2 number, since 2×2156647567² = 9302257456494038978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2156647567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156647547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078323783 + 1078323784.

It is an arithmetic number, because the mean of its divisors is an integer number (1078323784).

Almost surely, 2^2156647567 is an apocalyptic number.

2156647567 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156647567 is an equidigital number, since it uses as much as digits as its factorization.

2156647567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 49.

The square root of 2156647567 is about 46439.7197127631. The cubic root of 2156647567 is about 1291.9917086679.

The spelling of 2156647567 in words is "two billion, one hundred fifty-six million, six hundred forty-seven thousand, five hundred sixty-seven".