55855145 has 4 divisors (see below), whose sum is σ = 67026180. Its totient is φ = 44684112.

The previous prime is 55855141. The next prime is 55855157. The reversal of 55855145 is 54155855.

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 37356544 + 18498601 = 6112^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 55855145 - 2² = 55855141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55855099 and 55855108.

It is not an unprimeable number, because it can be changed into a prime (55855141) 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, 5585510 + ... + 5585519.

It is an arithmetic number, because the mean of its divisors is an integer number (16756545).

Almost surely, 2^55855145 is an apocalyptic number.

It is an amenable number.

55855145 is a deficient number, since it is larger than the sum of its proper divisors (11171035).

55855145 is a wasteful number, since it uses less digits than its factorization.

55855145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11171034.

The product of its digits is 100000, while the sum is 38.

The square root of 55855145 is about 7473.6299747847. The cubic root of 55855145 is about 382.2560735629.

The spelling of 55855145 in words is "fifty-five million, eight hundred fifty-five thousand, one hundred forty-five".