18717225505 has 16 divisors (see below), whose sum is σ = 25943877504. Its totient is φ = 12811790080.

The previous prime is 18717225493. The next prime is 18717225517. The reversal of 18717225505 is 50552271781.

It is an interprime number because it is at equal distance from previous prime (18717225493) and next prime (18717225517).

It is not a de Polignac number, because 18717225505 - 2¹³ = 18717217313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10008277 + ... + 10010146.

It is an arithmetic number, because the mean of its divisors is an integer number (1621492344).

Almost surely, 2^18717225505 is an apocalyptic number.

It is an amenable number.

18717225505 is a deficient number, since it is larger than the sum of its proper divisors (7226651999).

18717225505 is a wasteful number, since it uses less digits than its factorization.

18717225505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20018456.

The product of its (nonzero) digits is 196000, while the sum is 43.

The spelling of 18717225505 in words is "eighteen billion, seven hundred seventeen million, two hundred twenty-five thousand, five hundred five".