19449633947 has 4 divisors (see below), whose sum is σ = 19591602216. Its totient is φ = 19307665680.

The previous prime is 19449633923. The next prime is 19449633977. The reversal of 19449633947 is 74933694491.

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

It is a cyclic number.

It is not a de Polignac number, because 19449633947 - 2⁸ = 19449633691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19449633977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70983929 + ... + 70984202.

It is an arithmetic number, because the mean of its divisors is an integer number (4897900554).

Almost surely, 2^19449633947 is an apocalyptic number.

19449633947 is a deficient number, since it is larger than the sum of its proper divisors (141968269).

19449633947 is a wasteful number, since it uses less digits than its factorization.

19449633947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141968268.

The product of its digits is 17635968, while the sum is 59.

The spelling of 19449633947 in words is "nineteen billion, four hundred forty-nine million, six hundred thirty-three thousand, nine hundred forty-seven".