18785747071 has 32 divisors (see below), whose sum is σ = 24025358336. Its totient is φ = 14288400000.

The previous prime is 18785747069. The next prime is 18785747081. The reversal of 18785747071 is 17074758781.

It is a happy number.

It is not a de Polignac number, because 18785747071 - 2¹ = 18785747069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18785747081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 403921 + ... + 448021.

It is an arithmetic number, because the mean of its divisors is an integer number (750792448).

Almost surely, 2^18785747071 is an apocalyptic number.

18785747071 is a deficient number, since it is larger than the sum of its proper divisors (5239611265).

18785747071 is a wasteful number, since it uses less digits than its factorization.

18785747071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44303.

The product of its (nonzero) digits is 3073280, while the sum is 55.

The spelling of 18785747071 in words is "eighteen billion, seven hundred eighty-five million, seven hundred forty-seven thousand, seventy-one".