656213221642 has 8 divisors (see below), whose sum is σ = 1073803453632. Its totient is φ = 298278737100.

The previous prime is 656213221627. The next prime is 656213221667. The reversal of 656213221642 is 246122312656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 656213221595 and 656213221604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14913936834 + ... + 14913936877.

It is an arithmetic number, because the mean of its divisors is an integer number (134225431704).

Almost surely, 2^656213221642 is an apocalyptic number.

656213221642 is a deficient number, since it is larger than the sum of its proper divisors (417590231990).

656213221642 is a wasteful number, since it uses less digits than its factorization.

656213221642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29827873724.

The product of its digits is 207360, while the sum is 40.

The spelling of 656213221642 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred twenty-one thousand, six hundred forty-two".