18420172133 has 16 divisors (see below), whose sum is σ = 20230748736. Its totient is φ = 16632397440.

The previous prime is 18420172123. The next prime is 18420172151. The reversal of 18420172133 is 33127102481.

It is a cyclic number.

It is not a de Polignac number, because 18420172133 - 2²⁸ = 18151736677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18420172133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420172123) 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 15 ways as a sum of consecutive naturals, for example, 5013185 + ... + 5016857.

It is an arithmetic number, because the mean of its divisors is an integer number (1264421796).

Almost surely, 2^18420172133 is an apocalyptic number.

It is an amenable number.

18420172133 is a deficient number, since it is larger than the sum of its proper divisors (1810576603).

18420172133 is a wasteful number, since it uses less digits than its factorization.

18420172133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 18420172133 in words is "eighteen billion, four hundred twenty million, one hundred seventy-two thousand, one hundred thirty-three".