18751247117 has 4 divisors (see below), whose sum is σ = 19738154880. Its totient is φ = 17764339356.

The previous prime is 18751247113. The next prime is 18751247143. The reversal of 18751247117 is 71174215781.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71174215781 = 617 ⋅115355293.

It is a cyclic number.

It is not a de Polignac number, because 18751247117 - 2² = 18751247113 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 (18751247111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493453853 + ... + 493453890.

It is an arithmetic number, because the mean of its divisors is an integer number (4934538720).

Almost surely, 2^18751247117 is an apocalyptic number.

It is an amenable number.

18751247117 is a deficient number, since it is larger than the sum of its proper divisors (986907763).

18751247117 is an equidigital number, since it uses as much as digits as its factorization.

18751247117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986907762.

The product of its digits is 109760, while the sum is 44.

The spelling of 18751247117 in words is "eighteen billion, seven hundred fifty-one million, two hundred forty-seven thousand, one hundred seventeen".