56657977 has 2 divisors, whose sum is σ = 56657978. Its totient is φ = 56657976.

The previous prime is 56657971. The next prime is 56658029. The reversal of 56657977 is 77975665.

It is an a-pointer prime, because the next prime (56658029) can be obtained adding 56657977 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 2134521 = 7384^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 56657977 - 2³ = 56657969 is a prime.

It is not a weakly prime, because it can be changed into another prime (56657971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28328988 + 28328989.

It is an arithmetic number, because the mean of its divisors is an integer number (28328989).

Almost surely, 2^56657977 is an apocalyptic number.

It is an amenable number.

56657977 is a deficient number, since it is larger than the sum of its proper divisors (1).

56657977 is an equidigital number, since it uses as much as digits as its factorization.

56657977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2778300, while the sum is 52.

The square root of 56657977 is about 7527.1493276007. The cubic root of 56657977 is about 384.0788163775.

The spelling of 56657977 in words is "fifty-six million, six hundred fifty-seven thousand, nine hundred seventy-seven".