18874329785 has 4 divisors (see below), whose sum is σ = 22649195748. Its totient is φ = 15099463824.

The previous prime is 18874329779. The next prime is 18874329791. The reversal of 18874329785 is 58792347881.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18874329779) and next prime (18874329791).

It can be written as a sum of positive squares in 2 ways, for example, as 11289487504 + 7584842281 = 106252^2 + 87091^2 .

It is a cyclic number.

It is not a de Polignac number, because 18874329785 - 2³² = 14579362489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887432974 + ... + 1887432983.

It is an arithmetic number, because the mean of its divisors is an integer number (5662298937).

Almost surely, 2^18874329785 is an apocalyptic number.

It is an amenable number.

18874329785 is a deficient number, since it is larger than the sum of its proper divisors (3774865963).

18874329785 is an equidigital number, since it uses as much as digits as its factorization.

18874329785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774865962.

The product of its digits is 27095040, while the sum is 62.

The spelling of 18874329785 in words is "eighteen billion, eight hundred seventy-four million, three hundred twenty-nine thousand, seven hundred eighty-five".