55615537 has 2 divisors, whose sum is σ = 55615538. Its totient is φ = 55615536.

The previous prime is 55615513. The next prime is 55615559. The reversal of 55615537 is 73551655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49617936 + 5997601 = 7044^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 55615537 - 2⁷ = 55615409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55615496 and 55615505.

It is not a weakly prime, because it can be changed into another prime (55615577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27807768 + 27807769.

It is an arithmetic number, because the mean of its divisors is an integer number (27807769).

Almost surely, 2^55615537 is an apocalyptic number.

It is an amenable number.

55615537 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615537 is an equidigital number, since it uses as much as digits as its factorization.

55615537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 37.

The square root of 55615537 is about 7457.5825171432. The cubic root of 55615537 is about 381.7086880205.

The spelling of 55615537 in words is "fifty-five million, six hundred fifteen thousand, five hundred thirty-seven".