18700801785 has 24 divisors (see below), whose sum is σ = 32439401280. Its totient is φ = 9966167712.

The previous prime is 18700801741. The next prime is 18700801789. The reversal of 18700801785 is 58710800781.

It is not a de Polignac number, because 18700801785 - 2⁸ = 18700801529 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18700801785.

It is not an unprimeable number, because it can be changed into a prime (18700801789) 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, 98179 + ... + 216888.

It is an arithmetic number, because the mean of its divisors is an integer number (1351641720).

Almost surely, 2^18700801785 is an apocalyptic number.

18700801785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18700801785 is a deficient number, since it is larger than the sum of its proper divisors (13738599495).

18700801785 is a wasteful number, since it uses less digits than its factorization.

18700801785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316397 (or 316394 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 45.

The spelling of 18700801785 in words is "eighteen billion, seven hundred million, eight hundred one thousand, seven hundred eighty-five".