12312512223661 has 32 divisors (see below), whose sum is σ = 13473155912832. Its totient is φ = 11183555174400.

The previous prime is 12312512223619. The next prime is 12312512223707. The reversal of 12312512223661 is 16632221521321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12312512223661 - 2²⁵ = 12312478669229 is a prime.

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 12312512223661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312512223461) 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, 291171826 + ... + 291214108.

It is an arithmetic number, because the mean of its divisors is an integer number (421036122276).

Almost surely, 2^{12312512223661} is an apocalyptic number.

It is an amenable number.

12312512223661 is a deficient number, since it is larger than the sum of its proper divisors (1160643689171).

12312512223661 is a wasteful number, since it uses less digits than its factorization.

12312512223661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43453.

The product of its digits is 51840, while the sum is 37.

Adding to 12312512223661 its reverse (16632221521321), we get a palindrome (28944733744982).

The spelling of 12312512223661 in words is "twelve trillion, three hundred twelve billion, five hundred twelve million, two hundred twenty-three thousand, six hundred sixty-one".