56655661161661 has 4 divisors (see below), whose sum is σ = 56657428424800. Its totient is φ = 56653893898524.

The previous prime is 56655661161607. The next prime is 56655661161683. The reversal of 56655661161661 is 16616116655665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56655661161661 - 2¹¹ = 56655661159613 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 56655661161661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56655661161361) 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, 883583481 + ... + 883647598.

It is an arithmetic number, because the mean of its divisors is an integer number (14164357106200).

Almost surely, 2^{56655661161661} is an apocalyptic number.

It is an amenable number.

56655661161661 is a deficient number, since it is larger than the sum of its proper divisors (1767263139).

56655661161661 is a wasteful number, since it uses less digits than its factorization.

56655661161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767263138.

The product of its digits is 34992000, while the sum is 61.

The spelling of 56655661161661 in words is "fifty-six trillion, six hundred fifty-five billion, six hundred sixty-one million, one hundred sixty-one thousand, six hundred sixty-one".