656111413661 has 4 divisors (see below), whose sum is σ = 715757905824. Its totient is φ = 596464921500.

The previous prime is 656111413651. The next prime is 656111413681. The reversal of 656111413661 is 166314111656.

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 656111413661 - 2¹⁰ = 656111412637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656111413621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29823246065 + ... + 29823246086.

It is an arithmetic number, because the mean of its divisors is an integer number (178939476456).

Almost surely, 2^656111413661 is an apocalyptic number.

It is an amenable number.

656111413661 is a deficient number, since it is larger than the sum of its proper divisors (59646492163).

656111413661 is a wasteful number, since it uses less digits than its factorization.

656111413661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59646492162.

The product of its digits is 77760, while the sum is 41.

The spelling of 656111413661 in words is "six hundred fifty-six billion, one hundred eleven million, four hundred thirteen thousand, six hundred sixty-one".