55495557 has 32 divisors (see below), whose sum is σ = 89062400. Its totient is φ = 33950016.

The previous prime is 55495541. The next prime is 55495613. The reversal of 55495557 is 75559455.

55495557 is a `hidden beast` number, since 5 + 5 + 4 + 95 + 557 = 666.

It is not a de Polignac number, because 55495557 - 2⁴ = 55495541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55495457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77919 + ... + 78627.

It is an arithmetic number, because the mean of its divisors is an integer number (2783200).

Almost surely, 2^55495557 is an apocalyptic number.

It is an amenable number.

55495557 is a deficient number, since it is larger than the sum of its proper divisors (33566843).

55495557 is a wasteful number, since it uses less digits than its factorization.

55495557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 948 counting only the distinct ones).

The product of its digits is 787500, while the sum is 45.

The square root of 55495557 is about 7449.5340122722. The cubic root of 55495557 is about 381.4340023033.

The spelling of 55495557 in words is "fifty-five million, four hundred ninety-five thousand, five hundred fifty-seven".