123656043902 has 16 divisors (see below), whose sum is σ = 191641116672. Its totient is φ = 59779290360.

The previous prime is 123656043883. The next prime is 123656043961. The reversal of 123656043902 is 209340656321.

It is a self number, because there is not a number n which added to its sum of digits gives 123656043902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835718 + ... + 972489.

It is an arithmetic number, because the mean of its divisors is an integer number (11977569792).

Almost surely, 2^123656043902 is an apocalyptic number.

123656043902 is a deficient number, since it is larger than the sum of its proper divisors (67985072770).

123656043902 is a wasteful number, since it uses less digits than its factorization.

123656043902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809343.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 123656043902 in words is "one hundred twenty-three billion, six hundred fifty-six million, forty-three thousand, nine hundred two".