18649387694 has 16 divisors (see below), whose sum is σ = 32355566208. Its totient is φ = 7896297912.

The previous prime is 18649387663. The next prime is 18649387697. The reversal of 18649387694 is 49678394681.

18649387694 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×18649387694² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18649387694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18649387697) 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, 8023532 + ... + 8025855.

It is an arithmetic number, because the mean of its divisors is an integer number (2022222888).

Almost surely, 2^18649387694 is an apocalyptic number.

18649387694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18649387694 is a deficient number, since it is larger than the sum of its proper divisors (13706178514).

18649387694 is a wasteful number, since it uses less digits than its factorization.

18649387694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16049479.

The product of its digits is 62705664, while the sum is 65.

The spelling of 18649387694 in words is "eighteen billion, six hundred forty-nine million, three hundred eighty-seven thousand, six hundred ninety-four".