121660660 has 36 divisors (see below), whose sum is σ = 280830564. Its totient is φ = 44239360.

The previous prime is 121660633. The next prime is 121660681. The reversal of 121660660 is 66066121.

It can be written as a sum of positive squares in 2 ways, for example, as 59629284 + 62031376 = 7722^2 + 7876^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22717 + ... + 27556.

It is an arithmetic number, because the mean of its divisors is an integer number (7800849).

Almost surely, 2^121660660 is an apocalyptic number.

121660660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121660660 is an abundant number, since it is smaller than the sum of its proper divisors (159169904).

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

121660660 is a wasteful number, since it uses less digits than its factorization.

121660660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50304 (or 50291 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 121660660 is about 11029.9891205749. The cubic root of 121660660 is about 495.5072988492.

The spelling of 121660660 in words is "one hundred twenty-one million, six hundred sixty thousand, six hundred sixty".