18812809215 has 24 divisors (see below), whose sum is σ = 32614483200. Its totient is φ = 10031770944.

The previous prime is 18812809187. The next prime is 18812809217. The reversal of 18812809215 is 51290821881.

It is not a de Polignac number, because 18812809215 - 2⁶ = 18812809151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18812809217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253986 + ... + 319584.

It is an arithmetic number, because the mean of its divisors is an integer number (1358936800).

Almost surely, 2^18812809215 is an apocalyptic number.

18812809215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18812809215 is a deficient number, since it is larger than the sum of its proper divisors (13801673985).

18812809215 is a wasteful number, since it uses less digits than its factorization.

18812809215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71983 (or 71980 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 45.

The spelling of 18812809215 in words is "eighteen billion, eight hundred twelve million, eight hundred nine thousand, two hundred fifteen".