55155812 has 6 divisors (see below), whose sum is σ = 96522678. Its totient is φ = 27577904.

The previous prime is 55155809. The next prime is 55155829. The reversal of 55155812 is 21855155.

It can be written as a sum of positive squares in only one way, i.e., 52765696 + 2390116 = 7264^2 + 1546^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6894473 + ... + 6894480.

It is an arithmetic number, because the mean of its divisors is an integer number (16087113).

Almost surely, 2^55155812 is an apocalyptic number.

It is an amenable number.

55155812 is a deficient number, since it is larger than the sum of its proper divisors (41366866).

55155812 is a wasteful number, since it uses less digits than its factorization.

55155812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788957 (or 13788955 counting only the distinct ones).

The product of its digits is 10000, while the sum is 32.

The square root of 55155812 is about 7426.6959006008. The cubic root of 55155812 is about 380.6540260507.

The spelling of 55155812 in words is "fifty-five million, one hundred fifty-five thousand, eight hundred twelve".