18694902123 has 24 divisors (see below), whose sum is σ = 28430438400. Its totient is φ = 11805046704.

The previous prime is 18694902103. The next prime is 18694902131. The reversal of 18694902123 is 32120949681.

It is not a de Polignac number, because 18694902123 - 2⁶ = 18694902059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18694902103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1718086 + ... + 1728932.

It is an arithmetic number, because the mean of its divisors is an integer number (1184601600).

Almost surely, 2^18694902123 is an apocalyptic number.

18694902123 is a deficient number, since it is larger than the sum of its proper divisors (9735536277).

18694902123 is a wasteful number, since it uses less digits than its factorization.

18694902123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20951 (or 20948 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 18694902123 in words is "eighteen billion, six hundred ninety-four million, nine hundred two thousand, one hundred twenty-three".