208906123656 has 16 divisors (see below), whose sum is σ = 522265309200. Its totient is φ = 69635374544.

The previous prime is 208906123649. The next prime is 208906123661. The reversal of 208906123656 is 656321609802.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4352210886 + ... + 4352210933.

It is an arithmetic number, because the mean of its divisors is an integer number (32641581825).

Almost surely, 2^208906123656 is an apocalyptic number.

It is an amenable number.

208906123656 is an abundant number, since it is smaller than the sum of its proper divisors (313359185544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208906123656 is a wasteful number, since it uses less digits than its factorization.

208906123656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704421828 (or 8704421824 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 208906123656 in words is "two hundred eight billion, nine hundred six million, one hundred twenty-three thousand, six hundred fifty-six".