123681123225681 has 32 divisors (see below), whose sum is σ = 196661513533440. Its totient is φ = 67601813963904.

The previous prime is 123681123225679. The next prime is 123681123225691. The reversal of 123681123225681 is 186522321186321.

It is a happy number.

It is not a de Polignac number, because 123681123225681 - 2¹ = 123681123225679 is a prime.

It is a super-2 number, since 2×123681123225681² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123681123225691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160826826 + ... + 161594028.

It is an arithmetic number, because the mean of its divisors is an integer number (6145672297920).

Almost surely, 2^{123681123225681} is an apocalyptic number.

It is an amenable number.

123681123225681 is a deficient number, since it is larger than the sum of its proper divisors (72980390307759).

123681123225681 is a wasteful number, since it uses less digits than its factorization.

123681123225681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101005.

The product of its digits is 1658880, while the sum is 51.

The spelling of 123681123225681 in words is "one hundred twenty-three trillion, six hundred eighty-one billion, one hundred twenty-three million, two hundred twenty-five thousand, six hundred eighty-one".