121666666685 has 8 divisors (see below), whose sum is σ = 146118610176. Its totient is φ = 97254259920.

The previous prime is 121666666669. The next prime is 121666666697. The reversal of 121666666685 is 586666666121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121666666685 - 2⁴ = 121666666669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9877409 + ... + 9889718.

It is an arithmetic number, because the mean of its divisors is an integer number (18264826272).

Almost surely, 2^121666666685 is an apocalyptic number.

It is an amenable number.

121666666685 is a deficient number, since it is larger than the sum of its proper divisors (24451943491).

121666666685 is a wasteful number, since it uses less digits than its factorization.

121666666685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19768363.

The product of its digits is 22394880, while the sum is 59.

The spelling of 121666666685 in words is "one hundred twenty-one billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-five".