19218495939 has 8 divisors (see below), whose sum is σ = 25625551632. Its totient is φ = 12811885440.

The previous prime is 19218495913. The next prime is 19218495997. The reversal of 19218495939 is 93959481291.

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

It is not a de Polignac number, because 19218495939 - 2¹⁵ = 19218463171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19218495739) 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, 7567 + ... + 196199.

It is an arithmetic number, because the mean of its divisors is an integer number (3203193954).

Almost surely, 2^19218495939 is an apocalyptic number.

19218495939 is a deficient number, since it is larger than the sum of its proper divisors (6407055693).

19218495939 is a wasteful number, since it uses less digits than its factorization.

19218495939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222597.

The product of its digits is 6298560, while the sum is 60.

The spelling of 19218495939 in words is "nineteen billion, two hundred eighteen million, four hundred ninety-five thousand, nine hundred thirty-nine".