12511918437861 has 8 divisors (see below), whose sum is σ = 16683282424480. Its totient is φ = 8340916704912.

The previous prime is 12511918437839. The next prime is 12511918437877. The reversal of 12511918437861 is 16873481911521.

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

It is not a de Polignac number, because 12511918437861 - 2¹⁸ = 12511918175717 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 (12511918437881) 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, 90482815 + ... + 90620988.

It is an arithmetic number, because the mean of its divisors is an integer number (2085410303060).

Almost surely, 2^{12511918437861} is an apocalyptic number.

It is an amenable number.

12511918437861 is a deficient number, since it is larger than the sum of its proper divisors (4171363986619).

12511918437861 is a wasteful number, since it uses less digits than its factorization.

12511918437861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181126835.

The product of its digits is 2903040, while the sum is 57.

The spelling of 12511918437861 in words is "twelve trillion, five hundred eleven billion, nine hundred eighteen million, four hundred thirty-seven thousand, eight hundred sixty-one".