15643441064 has 32 divisors (see below), whose sum is σ = 29628649800. Its totient is φ = 7742841600.

The previous prime is 15643441043. The next prime is 15643441081. The reversal of 15643441064 is 46014434651.

It can be written as a sum of positive squares in 4 ways, for example, as 6686332900 + 8957108164 = 81770^2 + 94642^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314714 + ... + 361014.

Almost surely, 2^15643441064 is an apocalyptic number.

It is an amenable number.

15643441064 is a deficient number, since it is larger than the sum of its proper divisors (13985208736).

15643441064 is a wasteful number, since it uses less digits than its factorization.

15643441064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46733 (or 46729 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 15643441064 in words is "fifteen billion, six hundred forty-three million, four hundred forty-one thousand, sixty-four".