18743780865 has 64 divisors (see below), whose sum is σ = 32141131776. Its totient is φ = 9294461952.

The previous prime is 18743780837. The next prime is 18743780893. The reversal of 18743780865 is 56808734781.

It is an interprime number because it is at equal distance from previous prime (18743780837) and next prime (18743780893).

It is not a de Polignac number, because 18743780865 - 2¹⁰ = 18743779841 is a prime.

It is a super-2 number, since 2×18743780865² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16992904 + ... + 16994006.

It is an arithmetic number, because the mean of its divisors is an integer number (502205184).

Almost surely, 2^18743780865 is an apocalyptic number.

18743780865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18743780865 is a deficient number, since it is larger than the sum of its proper divisors (13397350911).

18743780865 is a wasteful number, since it uses less digits than its factorization.

18743780865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its (nonzero) digits is 9031680, while the sum is 57.

The spelling of 18743780865 in words is "eighteen billion, seven hundred forty-three million, seven hundred eighty thousand, eight hundred sixty-five".