1919965518 has 20 divisors (see below), whose sum is σ = 4302145320. Its totient is φ = 639988452.

The previous prime is 1919965511. The next prime is 1919965571. The reversal of 1919965518 is 8155699191.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919965511) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5925658 + ... + 5925981.

It is an arithmetic number, because the mean of its divisors is an integer number (215107266).

Almost surely, 2^1919965518 is an apocalyptic number.

1919965518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1919965518 is an abundant number, since it is smaller than the sum of its proper divisors (2382179802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1919965518 is a wasteful number, since it uses less digits than its factorization.

1919965518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11851653 (or 11851644 counting only the distinct ones).

The product of its digits is 874800, while the sum is 54.

The square root of 1919965518 is about 43817.4111284544. The cubic root of 1919965518 is about 1242.8855618098.

The spelling of 1919965518 in words is "one billion, nine hundred nineteen million, nine hundred sixty-five thousand, five hundred eighteen".