19656705099 has 4 divisors (see below), whose sum is σ = 26208940136. Its totient is φ = 13104470064.

The previous prime is 19656705097. The next prime is 19656705121. The reversal of 19656705099 is 99050765691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99050765691 = 3 ⋅33016921897.

It is not a de Polignac number, because 19656705099 - 2¹ = 19656705097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19656705097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3276117514 + ... + 3276117519.

It is an arithmetic number, because the mean of its divisors is an integer number (6552235034).

Almost surely, 2^19656705099 is an apocalyptic number.

19656705099 is a deficient number, since it is larger than the sum of its proper divisors (6552235037).

19656705099 is an equidigital number, since it uses as much as digits as its factorization.

19656705099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6552235036.

The product of its (nonzero) digits is 4592700, while the sum is 57.

The spelling of 19656705099 in words is "nineteen billion, six hundred fifty-six million, seven hundred five thousand, ninety-nine".