19406650668 has 24 divisors (see below), whose sum is σ = 45919964160. Its totient is φ = 6377772240.

The previous prime is 19406650661. The next prime is 19406650687. The reversal of 19406650668 is 86605660491.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19406650668.

It is not an unprimeable number, because it can be changed into a prime (19406650661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11388028 + ... + 11389731.

It is an arithmetic number, because the mean of its divisors is an integer number (1913331840).

Almost surely, 2^19406650668 is an apocalyptic number.

It is an amenable number.

19406650668 is an abundant number, since it is smaller than the sum of its proper divisors (26513313492).

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

19406650668 is a wasteful number, since it uses less digits than its factorization.

19406650668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22777837 (or 22777835 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 19406650668 in words is "nineteen billion, four hundred six million, six hundred fifty thousand, six hundred sixty-eight".