55616993 has 2 divisors, whose sum is σ = 55616994. Its totient is φ = 55616992.

The previous prime is 55616959. The next prime is 55617011. The reversal of 55616993 is 39961655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47224384 + 8392609 = 6872^2 + 2897^2 .

It is a cyclic number.

It is not a de Polignac number, because 55616993 - 2⁶ = 55616929 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 (55616593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27808496 + 27808497.

It is an arithmetic number, because the mean of its divisors is an integer number (27808497).

Almost surely, 2^55616993 is an apocalyptic number.

It is an amenable number.

55616993 is a deficient number, since it is larger than the sum of its proper divisors (1).

55616993 is an equidigital number, since it uses as much as digits as its factorization.

55616993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 44.

The square root of 55616993 is about 7457.6801352699. The cubic root of 55616993 is about 381.7120190021.

The spelling of 55616993 in words is "fifty-five million, six hundred sixteen thousand, nine hundred ninety-three".