19950806399 has 8 divisors (see below), whose sum is σ = 21482424720. Its totient is φ = 18458970496.

The previous prime is 19950806311. The next prime is 19950806411. The reversal of 19950806399 is 99360805991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19950806399 - 2¹⁶ = 19950740863 is a prime.

It is a super-3 number, since 3×19950806399³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950806299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9944564 + ... + 9946569.

It is an arithmetic number, because the mean of its divisors is an integer number (2685303090).

Almost surely, 2^19950806399 is an apocalyptic number.

19950806399 is a deficient number, since it is larger than the sum of its proper divisors (1531618321).

19950806399 is a wasteful number, since it uses less digits than its factorization.

19950806399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891209.

The product of its (nonzero) digits is 4723920, while the sum is 59.

The spelling of 19950806399 in words is "nineteen billion, nine hundred fifty million, eight hundred six thousand, three hundred ninety-nine".