18187755520117 has 4 divisors (see below), whose sum is σ = 18188067188736. Its totient is φ = 18187443851500.

The previous prime is 18187755520091. The next prime is 18187755520201. The reversal of 18187755520117 is 71102555778181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18187755520117 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 (18187725520117) 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, 155746759 + ... + 155863492.

It is an arithmetic number, because the mean of its divisors is an integer number (4547016797184).

Almost surely, 2^{18187755520117} is an apocalyptic number.

It is an amenable number.

18187755520117 is a deficient number, since it is larger than the sum of its proper divisors (311668619).

18187755520117 is an equidigital number, since it uses as much as digits as its factorization.

18187755520117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311668618.

The product of its (nonzero) digits is 5488000, while the sum is 58.

The spelling of 18187755520117 in words is "eighteen trillion, one hundred eighty-seven billion, seven hundred fifty-five million, five hundred twenty thousand, one hundred seventeen".