18368851885 has 8 divisors (see below), whose sum is σ = 22112159256. Its totient is φ = 14648723520.

The previous prime is 18368851877. The next prime is 18368851889. The reversal of 18368851885 is 58815886381.

It can be written as a sum of positive squares in 4 ways, for example, as 50041476 + 18318810409 = 7074^2 + 135347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18368851885 - 2³ = 18368851877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368851889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5793006 + ... + 5796175.

It is an arithmetic number, because the mean of its divisors is an integer number (2764019907).

Almost surely, 2^18368851885 is an apocalyptic number.

It is an amenable number.

18368851885 is a deficient number, since it is larger than the sum of its proper divisors (3743307371).

18368851885 is a wasteful number, since it uses less digits than its factorization.

18368851885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11589503.

The product of its digits is 14745600, while the sum is 61.

The spelling of 18368851885 in words is "eighteen billion, three hundred sixty-eight million, eight hundred fifty-one thousand, eight hundred eighty-five".