121665886628 has 24 divisors (see below), whose sum is σ = 250138257600. Its totient is φ = 51048623520.

The previous prime is 121665886579. The next prime is 121665886631. The reversal of 121665886628 is 826688566121.

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, 106350728 + ... + 106351871.

It is an arithmetic number, because the mean of its divisors is an integer number (10422427400).

Almost surely, 2^121665886628 is an apocalyptic number.

It is an amenable number.

121665886628 is an abundant number, since it is smaller than the sum of its proper divisors (128472370972).

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

121665886628 is a wasteful number, since it uses less digits than its factorization.

121665886628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212702627 (or 212702625 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 59.

The spelling of 121665886628 in words is "one hundred twenty-one billion, six hundred sixty-five million, eight hundred eighty-six thousand, six hundred twenty-eight".