18965372505 has 8 divisors (see below), whose sum is σ = 30344596032. Its totient is φ = 10114865328.

The previous prime is 18965372477. The next prime is 18965372509. The reversal of 18965372505 is 50527356981.

It is a happy number.

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

It is not a de Polignac number, because 18965372505 - 2²⁹ = 18428501593 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18965372509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632179069 + ... + 632179098.

It is an arithmetic number, because the mean of its divisors is an integer number (3793074504).

Almost surely, 2^18965372505 is an apocalyptic number.

18965372505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18965372505 is a deficient number, since it is larger than the sum of its proper divisors (11379223527).

18965372505 is a wasteful number, since it uses less digits than its factorization.

18965372505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264358175.

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 18965372505 in words is "eighteen billion, nine hundred sixty-five million, three hundred seventy-two thousand, five hundred five".