18131216157607 has 12 divisors (see below), whose sum is σ = 21131897305536. Its totient is φ = 15511213142880.

The previous prime is 18131216157601. The next prime is 18131216157631. The reversal of 18131216157607 is 70675161213181.

It is a de Polignac number, because none of the positive numbers 2^k-18131216157607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131216157601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355084663 + ... + 355135720.

It is an arithmetic number, because the mean of its divisors is an integer number (1760991442128).

Almost surely, 2^{18131216157607} is an apocalyptic number.

18131216157607 is a deficient number, since it is larger than the sum of its proper divisors (3000681147929).

18131216157607 is an equidigital number, since it uses as much as digits as its factorization.

18131216157607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710220918 (or 710220911 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 18131216157607 in words is "eighteen trillion, one hundred thirty-one billion, two hundred sixteen million, one hundred fifty-seven thousand, six hundred seven".