123581879992 has 32 divisors (see below), whose sum is σ = 232525818000. Its totient is φ = 61575220224.

The previous prime is 123581879969. The next prime is 123581880011. The reversal of 123581879992 is 299978185321.

It is a happy number.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 4724983 + ... + 4751065.

Almost surely, 2^123581879992 is an apocalyptic number.

It is an amenable number.

123581879992 is a deficient number, since it is larger than the sum of its proper divisors (108943938008).

123581879992 is a wasteful number, since it uses less digits than its factorization.

123581879992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28135 (or 28131 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 64.

The spelling of 123581879992 in words is "one hundred twenty-three billion, five hundred eighty-one million, eight hundred seventy-nine thousand, nine hundred ninety-two".