19779609599 has 8 divisors (see below), whose sum is σ = 20945796480. Its totient is φ = 18613720576.

The previous prime is 19779609569. The next prime is 19779609601. The reversal of 19779609599 is 99590697791.

It is a happy number.

It is a Cunningham number, because it is equal to 140640²-1.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19779609599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19779609559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70322 + ... + 210960.

It is an arithmetic number, because the mean of its divisors is an integer number (2618224560).

Almost surely, 2^19779609599 is an apocalyptic number.

19779609599 is a deficient number, since it is larger than the sum of its proper divisors (1166186881).

19779609599 is a wasteful number, since it uses less digits than its factorization.

19779609599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148929.

The product of its (nonzero) digits is 86802030, while the sum is 71.

The spelling of 19779609599 in words is "nineteen billion, seven hundred seventy-nine million, six hundred nine thousand, five hundred ninety-nine".