19631306664 has 128 divisors (see below), whose sum is σ = 55146960000. Its totient is φ = 6470323200.

The previous prime is 19631306647. The next prime is 19631306671. The reversal of 19631306664 is 46660313691.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7755079 + ... + 7757609.

It is an arithmetic number, because the mean of its divisors is an integer number (430835625).

Almost surely, 2^19631306664 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 19631306664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27573480000).

19631306664 is an abundant number, since it is smaller than the sum of its proper divisors (35515653336).

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

19631306664 is a wasteful number, since it uses less digits than its factorization.

19631306664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936 (or 2926 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 19631306664 in words is "nineteen billion, six hundred thirty-one million, three hundred six thousand, six hundred sixty-four".