121664415 has 32 divisors (see below), whose sum is σ = 203005440. Its totient is φ = 62165376.

The previous prime is 121664401. The next prime is 121664419. The reversal of 121664415 is 514466121.

It is not a de Polignac number, because 121664415 - 2⁶ = 121664351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121664419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32406 + ... + 35964.

It is an arithmetic number, because the mean of its divisors is an integer number (6343920).

Almost surely, 2^121664415 is an apocalyptic number.

121664415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121664415 is a deficient number, since it is larger than the sum of its proper divisors (81341025).

121664415 is a wasteful number, since it uses less digits than its factorization.

121664415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663.

The product of its digits is 5760, while the sum is 30.

The square root of 121664415 is about 11030.1593370178. The cubic root of 121664415 is about 495.5123966646.

The spelling of 121664415 in words is "one hundred twenty-one million, six hundred sixty-four thousand, four hundred fifteen".