121666510 has 24 divisors (see below), whose sum is σ = 254755800. Its totient is φ = 41714064.

The previous prime is 121666507. The next prime is 121666541. The reversal of 121666510 is 15666121.

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, 123660 + ... + 124639.

It is an arithmetic number, because the mean of its divisors is an integer number (10614825).

Almost surely, 2^121666510 is an apocalyptic number.

121666510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121666510 is an abundant number, since it is smaller than the sum of its proper divisors (133089290).

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

121666510 is a wasteful number, since it uses less digits than its factorization.

121666510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248320 (or 248313 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 121666510 is about 11030.2543035054. The cubic root of 121666510 is about 495.5152408063.

The spelling of 121666510 in words is "one hundred twenty-one million, six hundred sixty-six thousand, five hundred ten".