1299965568 has 128 divisors (see below), whose sum is σ = 3785538240. Its totient is φ = 391987200.

The previous prime is 1299965539. The next prime is 1299965657. The reversal of 1299965568 is 8655699921.

1299965568 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1017346 + ... + 1018622.

Almost surely, 2^1299965568 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 1299965568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1892769120).

1299965568 is an abundant number, since it is smaller than the sum of its proper divisors (2485572672).

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

1299965568 is a wasteful number, since it uses less digits than its factorization.

1299965568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546 (or 1534 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 60.

The square root of 1299965568 is about 36055.0352655492. The cubic root of 1299965568 is about 1091.3832473761.

The spelling of 1299965568 in words is "one billion, two hundred ninety-nine million, nine hundred sixty-five thousand, five hundred sixty-eight".