19015997805 has 128 divisors (see below), whose sum is σ = 39674880000. Its totient is φ = 8568141120.

The previous prime is 19015997797. The next prime is 19015997813. The reversal of 19015997805 is 50879951091.

It is an interprime number because it is at equal distance from previous prime (19015997797) and next prime (19015997813).

It is not a de Polignac number, because 19015997805 - 2³ = 19015997797 is a prime.

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 127 ways as a sum of consecutive naturals, for example, 5432946 + ... + 5436444.

It is an arithmetic number, because the mean of its divisors is an integer number (309960000).

Almost surely, 2^19015997805 is an apocalyptic number.

19015997805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19015997805 is an abundant number, since it is smaller than the sum of its proper divisors (20658882195).

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

19015997805 is an frugal number, since it uses more digits than its factorization.

19015997805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 54.

The spelling of 19015997805 in words is "nineteen billion, fifteen million, nine hundred ninety-seven thousand, eight hundred five".