19491660366 has 32 divisors (see below), whose sum is σ = 39959820288. Its totient is φ = 6335491680.

The previous prime is 19491660337. The next prime is 19491660401. The reversal of 19491660366 is 66306619491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51105 + ... + 203948.

It is an arithmetic number, because the mean of its divisors is an integer number (1248744384).

Almost surely, 2^19491660366 is an apocalyptic number.

19491660366 is an abundant number, since it is smaller than the sum of its proper divisors (20468159922).

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

19491660366 is a wasteful number, since it uses less digits than its factorization.

19491660366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255376.

The product of its (nonzero) digits is 1259712, while the sum is 51.

The spelling of 19491660366 in words is "nineteen billion, four hundred ninety-one million, six hundred sixty thousand, three hundred sixty-six".