19664266371 has 8 divisors (see below), whose sum is σ = 26610350784. Its totient is φ = 12913846440.

The previous prime is 19664266351. The next prime is 19664266417. The reversal of 19664266371 is 17366246691.

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

It is not a de Polignac number, because 19664266371 - 2¹⁴ = 19664249987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19664266331) 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, 48915885 + ... + 48916286.

It is an arithmetic number, because the mean of its divisors is an integer number (3326293848).

Almost surely, 2^19664266371 is an apocalyptic number.

19664266371 is a deficient number, since it is larger than the sum of its proper divisors (6946084413).

19664266371 is an equidigital number, since it uses as much as digits as its factorization.

19664266371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97832241.

The product of its digits is 1959552, while the sum is 51.

The spelling of 19664266371 in words is "nineteen billion, six hundred sixty-four million, two hundred sixty-six thousand, three hundred seventy-one".