121665964 has 24 divisors (see below), whose sum is σ = 247324448. Its totient is φ = 51287040.

The previous prime is 121665959. The next prime is 121665977. The reversal of 121665964 is 469566121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33909 + ... + 37324.

Almost surely, 2^121665964 is an apocalyptic number.

121665964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121665964 is an abundant number, since it is smaller than the sum of its proper divisors (125658484).

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

121665964 is a wasteful number, since it uses less digits than its factorization.

121665964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71305 (or 71303 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 121665964 is about 11030.2295533683. The cubic root of 121665964 is about 495.5144995677.

The spelling of 121665964 in words is "one hundred twenty-one million, six hundred sixty-five thousand, nine hundred sixty-four".