19664816046 has 16 divisors (see below), whose sum is σ = 41039616384. Its totient is φ = 6269941304.

The previous prime is 19664815967. The next prime is 19664816047. The reversal of 19664816046 is 64061846691.

It is a self number, because there is not a number n which added to its sum of digits gives 19664816046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664816047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71249196 + ... + 71249471.

It is an arithmetic number, because the mean of its divisors is an integer number (2564976024).

Almost surely, 2^19664816046 is an apocalyptic number.

19664816046 is an abundant number, since it is smaller than the sum of its proper divisors (21374800338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19664816046 is a wasteful number, since it uses less digits than its factorization.

19664816046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142498695.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 19664816046 in words is "nineteen billion, six hundred sixty-four million, eight hundred sixteen thousand, forty-six".