121445875818 has 12 divisors (see below), whose sum is σ = 263132730978. Its totient is φ = 40481958600.

The previous prime is 121445875801. The next prime is 121445875841. The reversal of 121445875818 is 818578544121.

121445875818 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 4 + 58 + 7 + 581 + 8 = 666.

121445875818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 63049703409 + 58396172409 = 251097^2 + 241653^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3373496533 + ... + 3373496568.

Almost surely, 2^121445875818 is an apocalyptic number.

121445875818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121445875818 is an abundant number, since it is smaller than the sum of its proper divisors (141686855160).

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

121445875818 is a wasteful number, since it uses less digits than its factorization.

121445875818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6746993109 (or 6746993106 counting only the distinct ones).

The product of its digits is 2867200, while the sum is 54.

The spelling of 121445875818 in words is "one hundred twenty-one billion, four hundred forty-five million, eight hundred seventy-five thousand, eight hundred eighteen".