55515857 has 4 divisors (see below), whose sum is σ = 56563380. Its totient is φ = 54468336.

The previous prime is 55515851. The next prime is 55515877. The reversal of 55515857 is 75851555.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31348801 + 24167056 = 5599^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 55515857 - 2⁴ = 55515841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55515851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523682 + ... + 523787.

It is an arithmetic number, because the mean of its divisors is an integer number (14140845).

Almost surely, 2^55515857 is an apocalyptic number.

It is an amenable number.

55515857 is a deficient number, since it is larger than the sum of its proper divisors (1047523).

55515857 is a wasteful number, since it uses less digits than its factorization.

55515857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047522.

The product of its digits is 175000, while the sum is 41.

The square root of 55515857 is about 7450.8963890260. The cubic root of 55515857 is about 381.4805055234.

The spelling of 55515857 in words is "fifty-five million, five hundred fifteen thousand, eight hundred fifty-seven".