19965797377 has 8 divisors (see below), whose sum is σ = 20302793280. Its totient is φ = 19631598480.

The previous prime is 19965797317. The next prime is 19965797389. The reversal of 19965797377 is 77379756991.

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 19965797377 - 2⁷ = 19965797249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19965797317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684853 + ... + 713410.

It is an arithmetic number, because the mean of its divisors is an integer number (2537849160).

Almost surely, 2^19965797377 is an apocalyptic number.

It is an amenable number.

19965797377 is a deficient number, since it is larger than the sum of its proper divisors (336995903).

19965797377 is a wasteful number, since it uses less digits than its factorization.

19965797377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398503.

The product of its digits is 157529610, while the sum is 70.

The spelling of 19965797377 in words is "nineteen billion, nine hundred sixty-five million, seven hundred ninety-seven thousand, three hundred seventy-seven".