18894453634 has 8 divisors (see below), whose sum is σ = 32390491968. Its totient is φ = 8097622980.

The previous prime is 18894453569. The next prime is 18894453637. The reversal of 18894453634 is 43635449881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18894453637) 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, 674801902 + ... + 674801929.

It is an arithmetic number, because the mean of its divisors is an integer number (4048811496).

Almost surely, 2^18894453634 is an apocalyptic number.

18894453634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18894453634 is a deficient number, since it is larger than the sum of its proper divisors (13496038334).

18894453634 is a wasteful number, since it uses less digits than its factorization.

18894453634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349603840.

The product of its digits is 9953280, while the sum is 55.

The spelling of 18894453634 in words is "eighteen billion, eight hundred ninety-four million, four hundred fifty-three thousand, six hundred thirty-four".