19664550156 has 48 divisors (see below), whose sum is σ = 48595299200. Its totient is φ = 6171748992.

The previous prime is 19664550149. The next prime is 19664550167. The reversal of 19664550156 is 65105546691.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 227401 + ... + 301728.

Almost surely, 2^19664550156 is an apocalyptic number.

It is an amenable number.

19664550156 is an abundant number, since it is smaller than the sum of its proper divisors (28930749044).

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

19664550156 is a wasteful number, since it uses less digits than its factorization.

19664550156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529318 (or 529316 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 19664550156 in words is "nineteen billion, six hundred sixty-four million, five hundred fifty thousand, one hundred fifty-six".