55565661 has 8 divisors (see below), whose sum is σ = 74295360. Its totient is φ = 36939872.

The previous prime is 55565659. The next prime is 55565663. The reversal of 55565661 is 16656555.

It is an interprime number because it is at equal distance from previous prime (55565659) and next prime (55565663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55565661 - 2¹ = 55565659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55565663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24720 + ... + 26873.

It is an arithmetic number, because the mean of its divisors is an integer number (9286920).

Almost surely, 2^55565661 is an apocalyptic number.

It is an amenable number.

55565661 is a deficient number, since it is larger than the sum of its proper divisors (18729699).

55565661 is a wasteful number, since it uses less digits than its factorization.

55565661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51955.

The product of its digits is 135000, while the sum is 39.

The square root of 55565661 is about 7454.2377879968. The cubic root of 55565661 is about 381.5945484742.

The spelling of 55565661 in words is "fifty-five million, five hundred sixty-five thousand, six hundred sixty-one".