656213214561 has 32 divisors (see below), whose sum is σ = 890659560960. Its totient is φ = 429661812096.

The previous prime is 656213214551. The next prime is 656213214577. The reversal of 656213214561 is 165412312656.

It is not a de Polignac number, because 656213214561 - 2⁵ = 656213214529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656213214551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155535510 + ... + 155539728.

It is an arithmetic number, because the mean of its divisors is an integer number (27833111280).

Almost surely, 2^656213214561 is an apocalyptic number.

It is an amenable number.

656213214561 is a deficient number, since it is larger than the sum of its proper divisors (234446346399).

656213214561 is a wasteful number, since it uses less digits than its factorization.

656213214561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413.

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

The spelling of 656213214561 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred fourteen thousand, five hundred sixty-one".