123662603531 has 4 divisors (see below), whose sum is σ = 123663381000. Its totient is φ = 123661826064.

The previous prime is 123662603521. The next prime is 123662603579. The reversal of 123662603531 is 135306266321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123662603531 - 2¹⁰ = 123662602507 is a prime.

It is a super-2 number, since 2×123662603531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123662603521) 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, 54161 + ... + 500258.

It is an arithmetic number, because the mean of its divisors is an integer number (30915845250).

Almost surely, 2^123662603531 is an apocalyptic number.

123662603531 is a deficient number, since it is larger than the sum of its proper divisors (777469).

123662603531 is an equidigital number, since it uses as much as digits as its factorization.

123662603531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777468.

The product of its (nonzero) digits is 116640, while the sum is 38.

Adding to 123662603531 its reverse (135306266321), we get a palindrome (258968869852).

The spelling of 123662603531 in words is "one hundred twenty-three billion, six hundred sixty-two million, six hundred three thousand, five hundred thirty-one".