19981869510 has 16 divisors (see below), whose sum is σ = 47956486896. Its totient is φ = 5328498528.

The previous prime is 19981869497. The next prime is 19981869541. The reversal of 19981869510 is 1596818991.

It is a super-2 number, since 2×19981869510² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333031129 + ... + 333031188.

It is an arithmetic number, because the mean of its divisors is an integer number (2997280431).

Almost surely, 2^19981869510 is an apocalyptic number.

19981869510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19981869510 is an abundant number, since it is smaller than the sum of its proper divisors (27974617386).

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

19981869510 is a wasteful number, since it uses less digits than its factorization.

19981869510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666062327.

The product of its (nonzero) digits is 1399680, while the sum is 57.

The spelling of 19981869510 in words is "nineteen billion, nine hundred eighty-one million, eight hundred sixty-nine thousand, five hundred ten".