123256938079 has 4 divisors (see below), whose sum is σ = 134462114280. Its totient is φ = 112051761880.

The previous prime is 123256938043. The next prime is 123256938097. The reversal of 123256938079 is 970839652321.

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 123256938079 - 2²³ = 123248549471 is a prime.

It is a super-2 number, since 2×123256938079² (a number of 23 digits) contains 22 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 (123256936079) 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, 5602588084 + ... + 5602588105.

It is an arithmetic number, because the mean of its divisors is an integer number (33615528570).

Almost surely, 2^123256938079 is an apocalyptic number.

123256938079 is a deficient number, since it is larger than the sum of its proper divisors (11205176201).

123256938079 is a wasteful number, since it uses less digits than its factorization.

123256938079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11205176200.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 123256938079 in words is "one hundred twenty-three billion, two hundred fifty-six million, nine hundred thirty-eight thousand, seventy-nine".