123665255131 has 8 divisors (see below), whose sum is σ = 134915369904. Its totient is φ = 112416443520.

The previous prime is 123665255101. The next prime is 123665255191. The reversal of 123665255131 is 131552566321.

It is a happy number.

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 123665255131 - 2¹¹ = 123665253083 is a prime.

It is a super-2 number, since 2×123665255131² (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 (123665255101) 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, 121810 + ... + 512023.

It is an arithmetic number, because the mean of its divisors is an integer number (16864421238).

Almost surely, 2^123665255131 is an apocalyptic number.

123665255131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123665255131 is a deficient number, since it is larger than the sum of its proper divisors (11250114773).

123665255131 is a wasteful number, since it uses less digits than its factorization.

123665255131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651581.

The product of its digits is 162000, while the sum is 40.

The spelling of 123665255131 in words is "one hundred twenty-three billion, six hundred sixty-five million, two hundred fifty-five thousand, one hundred thirty-one".