19966534506 has 40 divisors (see below), whose sum is σ = 44748072864. Its totient is φ = 6654285000.

The previous prime is 19966534433. The next prime is 19966534507. The reversal of 19966534506 is 60543566991.

19966534506 is a `hidden beast` number, since 19 + 96 + 6 + 5 + 34 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19966534507) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1445131 + ... + 1458881.

Almost surely, 2^19966534506 is an apocalyptic number.

19966534506 is an abundant number, since it is smaller than the sum of its proper divisors (24781538358).

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

19966534506 is a wasteful number, since it uses less digits than its factorization.

19966534506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22728 (or 22719 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 19966534506 in words is "nineteen billion, nine hundred sixty-six million, five hundred thirty-four thousand, five hundred six".