121556225656 has 16 divisors (see below), whose sum is σ = 227924628840. Its totient is φ = 60776324640.

The previous prime is 121556225633. The next prime is 121556225669. The reversal of 121556225656 is 656522655121.

It is a congruent number.

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, 91495 + ... + 501481.

Almost surely, 2^121556225656 is an apocalyptic number.

It is an amenable number.

121556225656 is a deficient number, since it is larger than the sum of its proper divisors (106368403184).

121556225656 is a wasteful number, since it uses less digits than its factorization.

121556225656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447054 (or 447050 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 46.

The spelling of 121556225656 in words is "one hundred twenty-one billion, five hundred fifty-six million, two hundred twenty-five thousand, six hundred fifty-six".