55117557 has 24 divisors (see below), whose sum is σ = 89759040. Its totient is φ = 33402600.

The previous prime is 55117547. The next prime is 55117609. The reversal of 55117557 is 75571155.

55117557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55117557 - 2⁴ = 55117541 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55117547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5169 + ... + 11702.

It is an arithmetic number, because the mean of its divisors is an integer number (3739960).

Almost surely, 2^55117557 is an apocalyptic number.

It is an amenable number.

55117557 is a deficient number, since it is larger than the sum of its proper divisors (34641483).

55117557 is a wasteful number, since it uses less digits than its factorization.

55117557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16902 (or 16885 counting only the distinct ones).

The product of its digits is 30625, while the sum is 36.

The square root of 55117557 is about 7424.1199478457. The cubic root of 55117557 is about 380.5660009502.

The spelling of 55117557 in words is "fifty-five million, one hundred seventeen thousand, five hundred fifty-seven".