123936644305 has 4 divisors (see below), whose sum is σ = 148723973172. Its totient is φ = 99149315440.

The previous prime is 123936644267. The next prime is 123936644309. The reversal of 123936644305 is 503446639321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39036670929 + 84899973376 = 197577^2 + 291376^2 .

It is not a de Polignac number, because 123936644305 - 2²³ = 123928255697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123936644309) 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, 12393664426 + ... + 12393664435.

It is an arithmetic number, because the mean of its divisors is an integer number (37180993293).

Almost surely, 2^123936644305 is an apocalyptic number.

It is an amenable number.

123936644305 is a deficient number, since it is larger than the sum of its proper divisors (24787328867).

123936644305 is an equidigital number, since it uses as much as digits as its factorization.

123936644305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24787328866.

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 123936644305 in words is "one hundred twenty-three billion, nine hundred thirty-six million, six hundred forty-four thousand, three hundred five".