123661352521 has 8 divisors (see below), whose sum is σ = 141335249984. Its totient is φ = 105989452560.

The previous prime is 123661352513. The next prime is 123661352533. The reversal of 123661352521 is 125253166321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123661352521 - 2³ = 123661352513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123661353521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364275 + ... + 616456.

It is an arithmetic number, because the mean of its divisors is an integer number (17666906248).

Almost surely, 2^123661352521 is an apocalyptic number.

It is an amenable number.

123661352521 is a deficient number, since it is larger than the sum of its proper divisors (17673897463).

123661352521 is an equidigital number, since it uses as much as digits as its factorization.

123661352521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998751.

The product of its digits is 64800, while the sum is 37.

The spelling of 123661352521 in words is "one hundred twenty-three billion, six hundred sixty-one million, three hundred fifty-two thousand, five hundred twenty-one".