12511112025661 has 8 divisors (see below), whose sum is σ = 12516600192800. Its totient is φ = 12505624976880.

The previous prime is 12511112025611. The next prime is 12511112025749. The reversal of 12511112025661 is 16652021111521.

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 12511112025661 - 2²¹ = 12511109928509 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 (12511112025611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22504795 + ... + 23054023.

It is an arithmetic number, because the mean of its divisors is an integer number (1564575024100).

Almost surely, 2^{12511112025661} is an apocalyptic number.

It is an amenable number.

12511112025661 is a deficient number, since it is larger than the sum of its proper divisors (5488167139).

12511112025661 is an equidigital number, since it uses as much as digits as its factorization.

12511112025661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559179.

The product of its (nonzero) digits is 7200, while the sum is 34.

The spelling of 12511112025661 in words is "twelve trillion, five hundred eleven billion, one hundred twelve million, twenty-five thousand, six hundred sixty-one".