55615757 has 2 divisors, whose sum is σ = 55615758. Its totient is φ = 55615756.

The previous prime is 55615753. The next prime is 55615759. The reversal of 55615757 is 75751655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45414121 + 10201636 = 6739^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 55615757 - 2² = 55615753 is a prime.

It is a super-2 number, since 2×55615757² = 6186224853366098, which contains 22 as substring.

Together with 55615759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55615753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27807878 + 27807879.

It is an arithmetic number, because the mean of its divisors is an integer number (27807879).

Almost surely, 2^55615757 is an apocalyptic number.

It is an amenable number.

55615757 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615757 is an equidigital number, since it uses as much as digits as its factorization.

55615757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183750, while the sum is 41.

The square root of 55615757 is about 7457.5972672168. The cubic root of 55615757 is about 381.7091913319.

The spelling of 55615757 in words is "fifty-five million, six hundred fifteen thousand, seven hundred fifty-seven".