123943679999 has 4 divisors (see below), whose sum is σ = 123958601520. Its totient is φ = 123928758480.

The previous prime is 123943679983. The next prime is 123943680013. The reversal of 123943679999 is 999976349321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123943679999 - 2⁴ = 123943679983 is a prime.

It is a super-3 number, since 3×123943679999³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123943679599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7448294 + ... + 7464915.

It is an arithmetic number, because the mean of its divisors is an integer number (30989650380).

Almost surely, 2^123943679999 is an apocalyptic number.

123943679999 is a deficient number, since it is larger than the sum of its proper divisors (14921521).

123943679999 is an equidigital number, since it uses as much as digits as its factorization.

123943679999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14921520.

The product of its digits is 178564176, while the sum is 71.

The spelling of 123943679999 in words is "one hundred twenty-three billion, nine hundred forty-three million, six hundred seventy-nine thousand, nine hundred ninety-nine".