55615559 has 2 divisors, whose sum is σ = 55615560. Its totient is φ = 55615558.

The previous prime is 55615537. The next prime is 55615577. The reversal of 55615559 is 95551655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55615559 - 2⁸ = 55615303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55615589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27807779 + 27807780.

It is an arithmetic number, because the mean of its divisors is an integer number (27807780).

Almost surely, 2^55615559 is an apocalyptic number.

55615559 is a deficient number, since it is larger than the sum of its proper divisors (1).

55615559 is an equidigital number, since it uses as much as digits as its factorization.

55615559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168750, while the sum is 41.

The square root of 55615559 is about 7457.5839921519. The cubic root of 55615559 is about 381.7087383517.

The spelling of 55615559 in words is "fifty-five million, six hundred fifteen thousand, five hundred fifty-nine".