19649699647 has 8 divisors (see below), whose sum is σ = 20152484352. Its totient is φ = 19148035200.

The previous prime is 19649699569. The next prime is 19649699651. The reversal of 19649699647 is 74699694691.

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 19649699647 - 2⁷ = 19649699519 is a prime.

It is a super-2 number, since 2×19649699647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649699677) 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, 244479 + ... + 314752.

It is an arithmetic number, because the mean of its divisors is an integer number (2519060544).

Almost surely, 2^19649699647 is an apocalyptic number.

19649699647 is a deficient number, since it is larger than the sum of its proper divisors (502784705).

19649699647 is an equidigital number, since it uses as much as digits as its factorization.

19649699647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560129.

The product of its digits is 158723712, while the sum is 70.

The spelling of 19649699647 in words is "nineteen billion, six hundred forty-nine million, six hundred ninety-nine thousand, six hundred forty-seven".