121660659 has 12 divisors (see below), whose sum is σ = 177288696. Its totient is φ = 80388672.

The previous prime is 121660633. The next prime is 121660681. The reversal of 121660659 is 956066121.

It is not a de Polignac number, because 121660659 - 2⁷ = 121660531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121660859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58797 + ... + 60830.

It is an arithmetic number, because the mean of its divisors is an integer number (14774058).

Almost surely, 2^121660659 is an apocalyptic number.

121660659 is a deficient number, since it is larger than the sum of its proper divisors (55628037).

121660659 is a wasteful number, since it uses less digits than its factorization.

121660659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119746 (or 119743 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 121660659 is about 11029.9890752439. The cubic root of 121660659 is about 495.5072974915.

The spelling of 121660659 in words is "one hundred twenty-one million, six hundred sixty thousand, six hundred fifty-nine".