19780199499 has 16 divisors (see below), whose sum is σ = 28041845760. Its totient is φ = 12359168640.

The previous prime is 19780199497. The next prime is 19780199503. The reversal of 19780199499 is 99499108791.

It is a happy number.

It is not a de Polignac number, because 19780199499 - 2¹ = 19780199497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19780199497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799207 + ... + 823584.

It is an arithmetic number, because the mean of its divisors is an integer number (1752615360).

Almost surely, 2^19780199499 is an apocalyptic number.

19780199499 is a deficient number, since it is larger than the sum of its proper divisors (8261646261).

19780199499 is a wasteful number, since it uses less digits than its factorization.

19780199499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623050.

The product of its (nonzero) digits is 13226976, while the sum is 66.

The spelling of 19780199499 in words is "nineteen billion, seven hundred eighty million, one hundred ninety-nine thousand, four hundred ninety-nine".