55768513 has 2 divisors, whose sum is σ = 55768514. Its totient is φ = 55768512.

The previous prime is 55768469. The next prime is 55768519. The reversal of 55768513 is 31586755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54287424 + 1481089 = 7368^2 + 1217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55768513 is a prime.

It is a super-2 number, since 2×55768513² = 6220254084462338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55768519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27884256 + 27884257.

It is an arithmetic number, because the mean of its divisors is an integer number (27884257).

Almost surely, 2^55768513 is an apocalyptic number.

It is an amenable number.

55768513 is a deficient number, since it is larger than the sum of its proper divisors (1).

55768513 is an equidigital number, since it uses as much as digits as its factorization.

55768513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 40.

The square root of 55768513 is about 7467.8318808072. The cubic root of 55768513 is about 382.0583433817.

The spelling of 55768513 in words is "fifty-five million, seven hundred sixty-eight thousand, five hundred thirteen".