56660993 has 2 divisors, whose sum is σ = 56660994. Its totient is φ = 56660992.

The previous prime is 56660977. The next prime is 56661001. The reversal of 56660993 is 39906665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41113744 + 15547249 = 6412^2 + 3943^2 .

It is a cyclic number.

It is not a de Polignac number, because 56660993 - 2⁴ = 56660977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56660953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28330496 + 28330497.

It is an arithmetic number, because the mean of its divisors is an integer number (28330497).

Almost surely, 2^56660993 is an apocalyptic number.

It is an amenable number.

56660993 is a deficient number, since it is larger than the sum of its proper divisors (1).

56660993 is an equidigital number, since it uses as much as digits as its factorization.

56660993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 56660993 is about 7527.3496663832. The cubic root of 56660993 is about 384.0856313117.

The spelling of 56660993 in words is "fifty-six million, six hundred sixty thousand, nine hundred ninety-three".