18521849734 has 4 divisors (see below), whose sum is σ = 27782774604. Its totient is φ = 9260924866.

The previous prime is 18521849729. The next prime is 18521849771. The reversal of 18521849734 is 43794812581.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4630462432 + ... + 4630462435.

It is an arithmetic number, because the mean of its divisors is an integer number (6945693651).

Almost surely, 2^18521849734 is an apocalyptic number.

18521849734 is a deficient number, since it is larger than the sum of its proper divisors (9260924870).

18521849734 is an equidigital number, since it uses as much as digits as its factorization.

18521849734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260924869.

The product of its digits is 1935360, while the sum is 52.

The spelling of 18521849734 in words is "eighteen billion, five hundred twenty-one million, eight hundred forty-nine thousand, seven hundred thirty-four".