56665877 has 2 divisors, whose sum is σ = 56665878. Its totient is φ = 56665876.

The previous prime is 56665871. The next prime is 56665891. The reversal of 56665877 is 77856665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56040196 + 625681 = 7486^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 56665877 - 2⁸ = 56665621 is a prime.

It is a super-2 number, since 2×56665877² = 6422043232358258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56665871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28332938 + 28332939.

It is an arithmetic number, because the mean of its divisors is an integer number (28332939).

Almost surely, 2^56665877 is an apocalyptic number.

It is an amenable number.

56665877 is a deficient number, since it is larger than the sum of its proper divisors (1).

56665877 is an equidigital number, since it uses as much as digits as its factorization.

56665877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 50.

The square root of 56665877 is about 7527.6740763665. The cubic root of 56665877 is about 384.0966666538.

The spelling of 56665877 in words is "fifty-six million, six hundred sixty-five thousand, eight hundred seventy-seven".