55065591 has 48 divisors (see below), whose sum is σ = 96595200. Its totient is φ = 29528064.

The previous prime is 55065587. The next prime is 55065631. The reversal of 55065591 is 19556055.

55065591 is a `hidden beast` number, since 5 + 5 + 0 + 65 + 591 = 666.

It is not a de Polignac number, because 55065591 - 2² = 55065587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55065511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214135 + ... + 214391.

It is an arithmetic number, because the mean of its divisors is an integer number (2012400).

Almost surely, 2^55065591 is an apocalyptic number.

55065591 is a deficient number, since it is larger than the sum of its proper divisors (41529609).

55065591 is a wasteful number, since it uses less digits than its factorization.

55065591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 55065591 is about 7420.6193137770. The cubic root of 55065591 is about 380.4463614477.

The spelling of 55065591 in words is "fifty-five million, sixty-five thousand, five hundred ninety-one".