123661352519 has 4 divisors (see below), whose sum is σ = 130935549744. Its totient is φ = 116387155296.

The previous prime is 123661352513. The next prime is 123661352533. The reversal of 123661352519 is 915253166321.

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 123661352519 - 2³² = 119366385223 is a prime.

It is a super-2 number, since 2×123661352519² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123661352519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123661352513) 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, 3637098587 + ... + 3637098620.

It is an arithmetic number, because the mean of its divisors is an integer number (32733887436).

Almost surely, 2^123661352519 is an apocalyptic number.

123661352519 is a deficient number, since it is larger than the sum of its proper divisors (7274197225).

123661352519 is an equidigital number, since it uses as much as digits as its factorization.

123661352519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274197224.

The product of its digits is 291600, while the sum is 44.

The spelling of 123661352519 in words is "one hundred twenty-three billion, six hundred sixty-one million, three hundred fifty-two thousand, five hundred nineteen".