55615605 has 16 divisors (see below), whose sum is σ = 90113280. Its totient is φ = 29285568.

The previous prime is 55615589. The next prime is 55615607. The reversal of 55615605 is 50651655.

It is not a de Polignac number, because 55615605 - 2⁴ = 55615589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55615607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22282 + ... + 24651.

It is an arithmetic number, because the mean of its divisors is an integer number (5632080).

Almost surely, 2^55615605 is an apocalyptic number.

It is an amenable number.

55615605 is a deficient number, since it is larger than the sum of its proper divisors (34497675).

55615605 is a wasteful number, since it uses less digits than its factorization.

55615605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47020.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 55615605 is about 7457.5870762600. The cubic root of 55615605 is about 381.7088435896.

It can be divided in two parts, 556 and 15605, that added together give a palindrome (16161).

The spelling of 55615605 in words is "fifty-five million, six hundred fifteen thousand, six hundred five".