19863869450 has 12 divisors (see below), whose sum is σ = 36946797270. Its totient is φ = 7945547760.

The previous prime is 19863869449. The next prime is 19863869513. The reversal of 19863869450 is 5496836891.

It can be written as a sum of positive squares in 3 ways, for example, as 9236939881 + 10626929569 = 96109^2 + 103087^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19863869450.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198638645 + ... + 198638744.

Almost surely, 2^19863869450 is an apocalyptic number.

19863869450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19863869450 is a deficient number, since it is larger than the sum of its proper divisors (17082927820).

19863869450 is a wasteful number, since it uses less digits than its factorization.

19863869450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397277401 (or 397277396 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 19863869450 in words is "nineteen billion, eight hundred sixty-three million, eight hundred sixty-nine thousand, four hundred fifty".