55512661 has 12 divisors (see below), whose sum is σ = 60516480. Its totient is φ = 50728680.

The previous prime is 55512607. The next prime is 55512673. The reversal of 55512661 is 16621555.

It is not a de Polignac number, because 55512661 - 2⁷ = 55512533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55512601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180670 + ... + 180976.

It is an arithmetic number, because the mean of its divisors is an integer number (5043040).

Almost surely, 2^55512661 is an apocalyptic number.

It is an amenable number.

55512661 is a deficient number, since it is larger than the sum of its proper divisors (5003819).

55512661 is an equidigital number, since it uses as much as digits as its factorization.

55512661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 357 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 55512661 is about 7450.6819151001. The cubic root of 55512661 is about 381.4731848817.

The spelling of 55512661 in words is "fifty-five million, five hundred twelve thousand, six hundred sixty-one".