18952817989 has 8 divisors (see below), whose sum is σ = 21852048960. Its totient is φ = 16101508416.

The previous prime is 18952817959. The next prime is 18952817993. The reversal of 18952817989 is 98971825981.

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

It is not a de Polignac number, because 18952817989 - 2¹³ = 18952809797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18952817959) 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, 11979499 + ... + 11981080.

It is an arithmetic number, because the mean of its divisors is an integer number (2731506120).

Almost surely, 2^18952817989 is an apocalyptic number.

It is an amenable number.

18952817989 is a deficient number, since it is larger than the sum of its proper divisors (2899230971).

18952817989 is a wasteful number, since it uses less digits than its factorization.

18952817989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23960699.

The product of its digits is 26127360, while the sum is 67.

The spelling of 18952817989 in words is "eighteen billion, nine hundred fifty-two million, eight hundred seventeen thousand, nine hundred eighty-nine".