18949655391 has 8 divisors (see below), whose sum is σ = 25285603200. Its totient is φ = 12623405592.

The previous prime is 18949655321. The next prime is 18949655393. The reversal of 18949655391 is 19355694981.

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

It is not a de Polignac number, because 18949655391 - 2²³ = 18941266783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949655393) 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, 2419941 + ... + 2427758.

It is an arithmetic number, because the mean of its divisors is an integer number (3160700400).

Almost surely, 2^18949655391 is an apocalyptic number.

18949655391 is a deficient number, since it is larger than the sum of its proper divisors (6335947809).

18949655391 is a wasteful number, since it uses less digits than its factorization.

18949655391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849005.

The product of its digits is 10497600, while the sum is 60.

The spelling of 18949655391 in words is "eighteen billion, nine hundred forty-nine million, six hundred fifty-five thousand, three hundred ninety-one".