18345885694 has 4 divisors (see below), whose sum is σ = 27518828544. Its totient is φ = 9172942846.

The previous prime is 18345885673. The next prime is 18345885697. The reversal of 18345885694 is 49658854381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49658854381 = 29 ⋅1712374289.

It is a super-3 number, since 3×18345885694³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18345885697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4586471422 + ... + 4586471425.

It is an arithmetic number, because the mean of its divisors is an integer number (6879707136).

Almost surely, 2^18345885694 is an apocalyptic number.

18345885694 is a deficient number, since it is larger than the sum of its proper divisors (9172942850).

18345885694 is an equidigital number, since it uses as much as digits as its factorization.

18345885694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172942849.

The product of its digits is 33177600, while the sum is 61.

The spelling of 18345885694 in words is "eighteen billion, three hundred forty-five million, eight hundred eighty-five thousand, six hundred ninety-four".