656434436551 has 4 divisors (see below), whose sum is σ = 656766138600. Its totient is φ = 656102734504.

The previous prime is 656434436513. The next prime is 656434436563. The reversal of 656434436551 is 155634434656.

656434436551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656434436551 - 2⁹ = 656434436039 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 (656434416551) 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, 165848056 + ... + 165852013.

It is an arithmetic number, because the mean of its divisors is an integer number (164191534650).

Almost surely, 2^656434436551 is an apocalyptic number.

656434436551 is a deficient number, since it is larger than the sum of its proper divisors (331702049).

656434436551 is a wasteful number, since it uses less digits than its factorization.

656434436551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331702048.

The product of its digits is 15552000, while the sum is 52.

The spelling of 656434436551 in words is "six hundred fifty-six billion, four hundred thirty-four million, four hundred thirty-six thousand, five hundred fifty-one".