55561512 has 16 divisors (see below), whose sum is σ = 138903840. Its totient is φ = 18520496.

The previous prime is 55561511. The next prime is 55561523. The reversal of 55561512 is 21516555.

It is a super-2 number, since 2×55561512² = 6174163231452288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55561512.

It is not an unprimeable number, because it can be changed into a prime (55561511) 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, 1157508 + ... + 1157555.

It is an arithmetic number, because the mean of its divisors is an integer number (8681490).

Almost surely, 2^55561512 is an apocalyptic number.

It is an amenable number.

55561512 is an abundant number, since it is smaller than the sum of its proper divisors (83342328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55561512 is a wasteful number, since it uses less digits than its factorization.

55561512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315072 (or 2315068 counting only the distinct ones).

The product of its digits is 7500, while the sum is 30.

The square root of 55561512 is about 7453.9594847302. The cubic root of 55561512 is about 381.5850505507.

The spelling of 55561512 in words is "fifty-five million, five hundred sixty-one thousand, five hundred twelve".