18307689705 has 48 divisors (see below), whose sum is σ = 32857727760. Its totient is φ = 9418752000.

The previous prime is 18307689703. The next prime is 18307689733. The reversal of 18307689705 is 50798670381.

It can be written as a sum of positive squares in 8 ways, for example, as 3146200281 + 15161489424 = 56091^2 + 123132^2 .

It is not a de Polignac number, because 18307689705 - 2¹ = 18307689703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18307689703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1561465 + ... + 1573145.

It is an arithmetic number, because the mean of its divisors is an integer number (684535995).

Almost surely, 2^18307689705 is an apocalyptic number.

18307689705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18307689705 is a deficient number, since it is larger than the sum of its proper divisors (14550038055).

18307689705 is a wasteful number, since it uses less digits than its factorization.

18307689705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12922 (or 12919 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 18307689705 in words is "eighteen billion, three hundred seven million, six hundred eighty-nine thousand, seven hundred five".