121415666 has 32 divisors (see below), whose sum is σ = 202849920. Its totient is φ = 54210816.

The previous prime is 121415659. The next prime is 121415699. The reversal of 121415666 is 666514121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108140 + ... + 109256.

It is an arithmetic number, because the mean of its divisors is an integer number (6339060).

Almost surely, 2^121415666 is an apocalyptic number.

121415666 is a deficient number, since it is larger than the sum of its proper divisors (81434254).

121415666 is a wasteful number, since it uses less digits than its factorization.

121415666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298.

The product of its digits is 8640, while the sum is 32.

The square root of 121415666 is about 11018.8777105475. The cubic root of 121415666 is about 495.1744662702.

Adding to 121415666 its reverse (666514121), we get a palindrome (787929787).

The spelling of 121415666 in words is "one hundred twenty-one million, four hundred fifteen thousand, six hundred sixty-six".