121980666 has 16 divisors (see below), whose sum is σ = 248565024. Its totient is φ = 39892944.

The previous prime is 121980659. The next prime is 121980667. The reversal of 121980666 is 666089121.

It is not an unprimeable number, because it can be changed into a prime (121980667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191476 + ... + 192111.

It is an arithmetic number, because the mean of its divisors is an integer number (15535314).

Almost surely, 2^121980666 is an apocalyptic number.

121980666 is an abundant number, since it is smaller than the sum of its proper divisors (126584358).

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

121980666 is a wasteful number, since it uses less digits than its factorization.

121980666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383645.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 121980666 is about 11044.4857734527. The cubic root of 121980666 is about 495.9413654457.

The spelling of 121980666 in words is "one hundred twenty-one million, nine hundred eighty thousand, six hundred sixty-six".