19890344325 has 12 divisors (see below), whose sum is σ = 32885369408. Its totient is φ = 10608183600.

The previous prime is 19890344323. The next prime is 19890344339. The reversal of 19890344325 is 52344309891.

It is not a de Polignac number, because 19890344325 - 2¹ = 19890344323 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890344323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132602221 + ... + 132602370.

Almost surely, 2^19890344325 is an apocalyptic number.

19890344325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19890344325 is a deficient number, since it is larger than the sum of its proper divisors (12995025083).

19890344325 is a wasteful number, since it uses less digits than its factorization.

19890344325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265204604 (or 265204599 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 19890344325 in words is "nineteen billion, eight hundred ninety million, three hundred forty-four thousand, three hundred twenty-five".