19808664514 has 4 divisors (see below), whose sum is σ = 29712996774. Its totient is φ = 9904332256.

The previous prime is 19808664481. The next prime is 19808664527. The reversal of 19808664514 is 41546680891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19117763289 + 690901225 = 138267^2 + 26285^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4952166127 + ... + 4952166130.

Almost surely, 2^19808664514 is an apocalyptic number.

19808664514 is a deficient number, since it is larger than the sum of its proper divisors (9904332260).

19808664514 is an equidigital number, since it uses as much as digits as its factorization.

19808664514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9904332259.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 19808664514 in words is "nineteen billion, eight hundred eight million, six hundred sixty-four thousand, five hundred fourteen".