18657852133 has 4 divisors (see below), whose sum is σ = 18659637388. Its totient is φ = 18656066880.

The previous prime is 18657852131. The next prime is 18657852139. The reversal of 18657852133 is 33125875681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287573764 + 18370278369 = 16958^2 + 135537^2 .

It is a cyclic number.

It is not a de Polignac number, because 18657852133 - 2¹ = 18657852131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18657852131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876858 + ... + 897883.

It is an arithmetic number, because the mean of its divisors is an integer number (4664909347).

Almost surely, 2^18657852133 is an apocalyptic number.

It is an amenable number.

18657852133 is a deficient number, since it is larger than the sum of its proper divisors (1785255).

18657852133 is a wasteful number, since it uses less digits than its factorization.

18657852133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785254.

The product of its digits is 1209600, while the sum is 49.

The spelling of 18657852133 in words is "eighteen billion, six hundred fifty-seven million, eight hundred fifty-two thousand, one hundred thirty-three".