656211505642 has 32 divisors (see below), whose sum is σ = 1229183470080. Its totient is φ = 255253751280.

The previous prime is 656211505601. The next prime is 656211505849. The reversal of 656211505642 is 246505112656.

It is a super-2 number, since 2×656211505642² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3346608 + ... + 3537259.

It is an arithmetic number, because the mean of its divisors is an integer number (38411983440).

Almost surely, 2^656211505642 is an apocalyptic number.

656211505642 is a deficient number, since it is larger than the sum of its proper divisors (572971964438).

656211505642 is a wasteful number, since it uses less digits than its factorization.

656211505642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6884506.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 656211505642 in words is "six hundred fifty-six billion, two hundred eleven million, five hundred five thousand, six hundred forty-two".