12123500656531 has 64 divisors (see below), whose sum is σ = 14875487502336. Its totient is φ = 9744351091200.

The previous prime is 12123500656529. The next prime is 12123500656621. The reversal of 12123500656531 is 13565600532121.

It is a happy number.

It is not a de Polignac number, because 12123500656531 - 2¹ = 12123500656529 is a prime.

It is a super-2 number, since 2×12123500656531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12123500656031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95319726 + ... + 95446828.

It is an arithmetic number, because the mean of its divisors is an integer number (232429492224).

Almost surely, 2^{12123500656531} is an apocalyptic number.

12123500656531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12123500656531 is a deficient number, since it is larger than the sum of its proper divisors (2751986845805).

12123500656531 is a wasteful number, since it uses less digits than its factorization.

12123500656531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127552.

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

The spelling of 12123500656531 in words is "twelve trillion, one hundred twenty-three billion, five hundred million, six hundred fifty-six thousand, five hundred thirty-one".