18870374385 has 80 divisors (see below), whose sum is σ = 35063796240. Its totient is φ = 9697605120.

The previous prime is 18870374363. The next prime is 18870374389. The reversal of 18870374385 is 58347307881.

It can be written as a sum of positive squares in 8 ways, for example, as 1125736704 + 17744637681 = 33552^2 + 133209^2 .

It is not a de Polignac number, because 18870374385 - 2⁸ = 18870374129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18870374389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7198375 + ... + 7200995.

It is an arithmetic number, because the mean of its divisors is an integer number (438297453).

Almost surely, 2^18870374385 is an apocalyptic number.

18870374385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18870374385 is a deficient number, since it is larger than the sum of its proper divisors (16193421855).

18870374385 is a wasteful number, since it uses less digits than its factorization.

18870374385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280 (or 3271 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 18870374385 in words is "eighteen billion, eight hundred seventy million, three hundred seventy-four thousand, three hundred eighty-five".