2056978667 has 2 divisors, whose sum is σ = 2056978668. Its totient is φ = 2056978666.

The previous prime is 2056978661. The next prime is 2056978669. The reversal of 2056978667 is 7668796502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2056978667 - 2⁶ = 2056978603 is a prime.

It is a super-2 number, since 2×2056978667² = 8462322472986193778, which contains 22 as substring.

Together with 2056978669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2056978661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028489333 + 1028489334.

It is an arithmetic number, because the mean of its divisors is an integer number (1028489334).

Almost surely, 2^2056978667 is an apocalyptic number.

2056978667 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056978667 is an equidigital number, since it uses as much as digits as its factorization.

2056978667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The square root of 2056978667 is about 45353.9266987986. The cubic root of 2056978667 is about 1271.7739623384.

The spelling of 2056978667 in words is "two billion, fifty-six million, nine hundred seventy-eight thousand, six hundred sixty-seven".