121663664 has 30 divisors (see below), whose sum is σ = 240388260. Its totient is φ = 59634208.

The previous prime is 121663651. The next prime is 121663697. The reversal of 121663664 is 466366121.

121663664 = T₁₈₅ + T₁₈₆ + ... + T₉₀₂.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338717 + ... + 339075.

It is an arithmetic number, because the mean of its divisors is an integer number (8012942).

Almost surely, 2^121663664 is an apocalyptic number.

It is an amenable number.

121663664 is a deficient number, since it is larger than the sum of its proper divisors (118724596).

121663664 is an frugal number, since it uses more digits than its factorization.

121663664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 420 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 121663664 is about 11030.1252939393. The cubic root of 121663664 is about 495.5113771099.

The spelling of 121663664 in words is "one hundred twenty-one million, six hundred sixty-three thousand, six hundred sixty-four".