123640272823 has 4 divisors (see below), whose sum is σ = 124099902360. Its totient is φ = 123180643288.

The previous prime is 123640272793. The next prime is 123640272829. The reversal of 123640272823 is 328272046321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328272046321 = 173141 ⋅1895981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123640272823 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 (123640272829) 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, 229814365 + ... + 229814902.

It is an arithmetic number, because the mean of its divisors is an integer number (31024975590).

Almost surely, 2^123640272823 is an apocalyptic number.

123640272823 is a deficient number, since it is larger than the sum of its proper divisors (459629537).

123640272823 is an equidigital number, since it uses as much as digits as its factorization.

123640272823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459629536.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 123640272823 in words is "one hundred twenty-three billion, six hundred forty million, two hundred seventy-two thousand, eight hundred twenty-three".