656213215461 has 16 divisors (see below), whose sum is σ = 890792041920. Its totient is φ = 429625969920.

The previous prime is 656213215453. The next prime is 656213215481. The reversal of 656213215461 is 164512312656.

It is not a de Polignac number, because 656213215461 - 2³ = 656213215453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656213215481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8842555 + ... + 8916456.

It is an arithmetic number, because the mean of its divisors is an integer number (55674502620).

Almost surely, 2^656213215461 is an apocalyptic number.

It is an amenable number.

656213215461 is a deficient number, since it is larger than the sum of its proper divisors (234578826459).

656213215461 is a wasteful number, since it uses less digits than its factorization.

656213215461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17759236.

The product of its digits is 259200, while the sum is 42.

The spelling of 656213215461 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred fifteen thousand, four hundred sixty-one".