121366660 has 48 divisors (see below), whose sum is σ = 263052720. Its totient is φ = 47001600.

The previous prime is 121366657. The next prime is 121366669. The reversal of 121366660 is 66663121.

It can be written as a sum of positive squares in 8 ways, for example, as 55562116 + 65804544 = 7454^2 + 8112^2 .

It is not an unprimeable number, because it can be changed into a prime (121366669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296536 + ... + 296944.

It is an arithmetic number, because the mean of its divisors is an integer number (5480265).

Almost surely, 2^121366660 is an apocalyptic number.

121366660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121366660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131526360).

121366660 is an abundant number, since it is smaller than the sum of its proper divisors (141686060).

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

121366660 is a wasteful number, since it uses less digits than its factorization.

121366660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 121366660 is about 11016.6537569264. The cubic root of 121366660 is about 495.1078362483.

The spelling of 121366660 in words is "one hundred twenty-one million, three hundred sixty-six thousand, six hundred sixty".