121579518666 has 16 divisors (see below), whose sum is σ = 243526910688. Its totient is φ = 40465194000.

The previous prime is 121579518659. The next prime is 121579518673. The reversal of 121579518666 is 666815975121.

It is an interprime number because it is at equal distance from previous prime (121579518659) and next prime (121579518673).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15323760 + ... + 15331691.

It is an arithmetic number, because the mean of its divisors is an integer number (15220431918).

Almost surely, 2^121579518666 is an apocalyptic number.

121579518666 is an abundant number, since it is smaller than the sum of its proper divisors (121947392022).

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

121579518666 is a wasteful number, since it uses less digits than its factorization.

121579518666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30656117.

The product of its digits is 5443200, while the sum is 57.

The spelling of 121579518666 in words is "one hundred twenty-one billion, five hundred seventy-nine million, five hundred eighteen thousand, six hundred sixty-six".