121965664 has 12 divisors (see below), whose sum is σ = 240119964. Its totient is φ = 60982816.

The previous prime is 121965647. The next prime is 121965703. The reversal of 121965664 is 466569121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1905682 + ... + 1905745.

It is an arithmetic number, because the mean of its divisors is an integer number (20009997).

Almost surely, 2^121965664 is an apocalyptic number.

It is an amenable number.

121965664 is a deficient number, since it is larger than the sum of its proper divisors (118154300).

121965664 is an equidigital number, since it uses as much as digits as its factorization.

121965664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811437 (or 3811429 counting only the distinct ones).

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

The square root of 121965664 is about 11043.8065901210. The cubic root of 121965664 is about 495.9210332142.

The spelling of 121965664 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, six hundred sixty-four".