18995785453 has 4 divisors (see below), whose sum is σ = 19132445920. Its totient is φ = 18859124988.

The previous prime is 18995785451. The next prime is 18995785483. The reversal of 18995785453 is 35458759981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18995785453 - 2¹ = 18995785451 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 (18995785451) 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, 68330025 + ... + 68330302.

It is an arithmetic number, because the mean of its divisors is an integer number (4783111480).

Almost surely, 2^18995785453 is an apocalyptic number.

It is an amenable number.

18995785453 is a deficient number, since it is larger than the sum of its proper divisors (136660467).

18995785453 is a wasteful number, since it uses less digits than its factorization.

18995785453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136660466.

The product of its digits is 54432000, while the sum is 64.

The spelling of 18995785453 in words is "eighteen billion, nine hundred ninety-five million, seven hundred eighty-five thousand, four hundred fifty-three".