55811885 has 4 divisors (see below), whose sum is σ = 66974268. Its totient is φ = 44649504.

The previous prime is 55811881. The next prime is 55811891. The reversal of 55811885 is 58811855.

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 43059844 + 12752041 = 6562^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 55811885 - 2² = 55811881 is a prime.

It is a super-2 number, since 2×55811885² = 6229933014506450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55811881) 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, 5581184 + ... + 5581193.

It is an arithmetic number, because the mean of its divisors is an integer number (16743567).

Almost surely, 2^55811885 is an apocalyptic number.

It is an amenable number.

55811885 is a deficient number, since it is larger than the sum of its proper divisors (11162383).

55811885 is a wasteful number, since it uses less digits than its factorization.

55811885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11162382.

The product of its digits is 64000, while the sum is 41.

The square root of 55811885 is about 7470.7352382480. The cubic root of 55811885 is about 382.1573618641.

The spelling of 55811885 in words is "fifty-five million, eight hundred eleven thousand, eight hundred eighty-five".