12501156512661 has 8 divisors (see below), whose sum is σ = 16705834438560. Its totient is φ = 8315291464272.

The previous prime is 12501156512657. The next prime is 12501156512681. The reversal of 12501156512661 is 16621565110521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12501156512661 - 2² = 12501156512657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501156512681) 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, 4703217826 + ... + 4703220483.

It is an arithmetic number, because the mean of its divisors is an integer number (2088229304820).

Almost surely, 2^{12501156512661} is an apocalyptic number.

It is an amenable number.

12501156512661 is a deficient number, since it is larger than the sum of its proper divisors (4204677925899).

12501156512661 is an equidigital number, since it uses as much as digits as its factorization.

12501156512661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9406438755.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 12501156512661 in words is "twelve trillion, five hundred one billion, one hundred fifty-six million, five hundred twelve thousand, six hundred sixty-one".