55989965 has 4 divisors (see below), whose sum is σ = 67187964. Its totient is φ = 44791968.

The previous prime is 55989953. The next prime is 55989971. The reversal of 55989965 is 56998955.

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 35022724 + 20967241 = 5918^2 + 4579^2 .

It is a cyclic number.

It is not a de Polignac number, because 55989965 - 2⁴ = 55989949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55989965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5598992 + ... + 5599001.

It is an arithmetic number, because the mean of its divisors is an integer number (16796991).

Almost surely, 2^55989965 is an apocalyptic number.

It is an amenable number.

55989965 is a deficient number, since it is larger than the sum of its proper divisors (11197999).

55989965 is a wasteful number, since it uses less digits than its factorization.

55989965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11197998.

The product of its digits is 4374000, while the sum is 56.

The square root of 55989965 is about 7482.6442518671. The cubic root of 55989965 is about 382.5633824936.

The spelling of 55989965 in words is "fifty-five million, nine hundred eighty-nine thousand, nine hundred sixty-five".