18453638957 has 4 divisors (see below), whose sum is σ = 19873149660. Its totient is φ = 17034128256.

The previous prime is 18453638939. The next prime is 18453638981. The reversal of 18453638957 is 75983635481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75983635481 = 13 ⋅5844895037.

It can be written as a sum of positive squares in 2 ways, for example, as 6921241636 + 11532397321 = 83194^2 + 107389^2 .

It is a cyclic number.

It is not a de Polignac number, because 18453638957 - 2²² = 18449444653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18453638896 and 18453638905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18453638257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709755332 + ... + 709755357.

It is an arithmetic number, because the mean of its divisors is an integer number (4968287415).

Almost surely, 2^18453638957 is an apocalyptic number.

It is an amenable number.

18453638957 is a deficient number, since it is larger than the sum of its proper divisors (1419510703).

18453638957 is a wasteful number, since it uses less digits than its factorization.

18453638957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419510702.

The product of its digits is 21772800, while the sum is 59.

The spelling of 18453638957 in words is "eighteen billion, four hundred fifty-three million, six hundred thirty-eight thousand, nine hundred fifty-seven".