123117557279 has 4 divisors (see below), whose sum is σ = 128470494576. Its totient is φ = 117764619984.

The previous prime is 123117557273. The next prime is 123117557293. The reversal of 123117557279 is 972755711321.

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 123117557279 - 2¹⁶ = 123117491743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123117557273) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2676468614 + ... + 2676468659.

It is an arithmetic number, because the mean of its divisors is an integer number (32117623644).

Almost surely, 2^123117557279 is an apocalyptic number.

123117557279 is a deficient number, since it is larger than the sum of its proper divisors (5352937297).

123117557279 is an equidigital number, since it uses as much as digits as its factorization.

123117557279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352937296.

The product of its digits is 926100, while the sum is 50.

The spelling of 123117557279 in words is "one hundred twenty-three billion, one hundred seventeen million, five hundred fifty-seven thousand, two hundred seventy-nine".