19800137800 has 24 divisors (see below), whose sum is σ = 46035320850. Its totient is φ = 7920055040.

The previous prime is 19800137767. The next prime is 19800137809. The reversal of 19800137800 is 873100891.

It can be written as a sum of positive squares in 3 ways, for example, as 17501702436 + 2298435364 = 132294^2 + 47942^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19800137800.

It is not an unprimeable number, because it can be changed into a prime (19800137809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49500145 + ... + 49500544.

Almost surely, 2^19800137800 is an apocalyptic number.

19800137800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19800137800 is an abundant number, since it is smaller than the sum of its proper divisors (26235183050).

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

19800137800 is a wasteful number, since it uses less digits than its factorization.

19800137800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99000705 (or 99000696 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 19800137800 in words is "nineteen billion, eight hundred million, one hundred thirty-seven thousand, eight hundred".