19949445608 has 8 divisors (see below), whose sum is σ = 37405210530. Its totient is φ = 9974722800.

The previous prime is 19949445547. The next prime is 19949445629. The reversal of 19949445608 is 80654494991.

It can be written as a sum of positive squares in only one way, i.e., 11181370564 + 8768075044 = 105742^2 + 93638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1246840343 + ... + 1246840358.

Almost surely, 2^19949445608 is an apocalyptic number.

It is an amenable number.

19949445608 is a deficient number, since it is larger than the sum of its proper divisors (17455764922).

19949445608 is a wasteful number, since it uses less digits than its factorization.

19949445608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493680707 (or 2493680703 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 19949445608 in words is "nineteen billion, nine hundred forty-nine million, four hundred forty-five thousand, six hundred eight".