13033220644 has 12 divisors (see below), whose sum is σ = 22824661468. Its totient is φ = 6511888800.

The previous prime is 13033220633. The next prime is 13033220693. The reversal of 13033220644 is 44602233031.

It can be written as a sum of positive squares in 2 ways, for example, as 2692364544 + 10340856100 = 51888^2 + 101690^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1174167 + ... + 1185214.

Almost surely, 2^13033220644 is an apocalyptic number.

It is an amenable number.

13033220644 is a deficient number, since it is larger than the sum of its proper divisors (9791440824).

13033220644 is a wasteful number, since it uses less digits than its factorization.

13033220644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360766 (or 2360764 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 13033220644 its reverse (44602233031), we get a palindrome (57635453675).

The spelling of 13033220644 in words is "thirteen billion, thirty-three million, two hundred twenty thousand, six hundred forty-four".