19660954368 has 144 divisors (see below), whose sum is σ = 60088694400. Its totient is φ = 5644247040.

The previous prime is 19660954367. The next prime is 19660954399. The reversal of 19660954368 is 86345906691.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (19660954361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99268 + ... + 221756.

It is an arithmetic number, because the mean of its divisors is an integer number (417282600).

Almost surely, 2^19660954368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19660954368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30044347200).

19660954368 is an abundant number, since it is smaller than the sum of its proper divisors (40427740032).

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

19660954368 is a wasteful number, since it uses less digits than its factorization.

19660954368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122538 (or 122524 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 19660954368 in words is "nineteen billion, six hundred sixty million, nine hundred fifty-four thousand, three hundred sixty-eight".