12531625421501 has 4 divisors (see below), whose sum is σ = 12532299437052. Its totient is φ = 12530951405952.

The previous prime is 12531625421489. The next prime is 12531625421519. The reversal of 12531625421501 is 10512452613521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5628258036025 + 6903367385476 = 2372395^2 + 2627426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12531625421501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531625421101) 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, 336979886 + ... + 337017071.

It is an arithmetic number, because the mean of its divisors is an integer number (3133074859263).

Almost surely, 2^{12531625421501} is an apocalyptic number.

It is an amenable number.

12531625421501 is a deficient number, since it is larger than the sum of its proper divisors (674015551).

12531625421501 is an equidigital number, since it uses as much as digits as its factorization.

12531625421501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674015550.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 12531625421501 in words is "twelve trillion, five hundred thirty-one billion, six hundred twenty-five million, four hundred twenty-one thousand, five hundred one".