1299706664 has 8 divisors (see below), whose sum is σ = 2436950010. Its totient is φ = 649853328.

The previous prime is 1299706613. The next prime is 1299706699. The reversal of 1299706664 is 4666079921.

It can be written as a sum of positive squares in only one way, i.e., 839260900 + 460445764 = 28970^2 + 21458^2 .

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, 81231659 + ... + 81231674.

Almost surely, 2^1299706664 is an apocalyptic number.

It is an amenable number.

1299706664 is a deficient number, since it is larger than the sum of its proper divisors (1137243346).

1299706664 is a wasteful number, since it uses less digits than its factorization.

1299706664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162463339 (or 162463335 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1299706664 is about 36051.4446867251. Note that the first 3 decimals coincide. The cubic root of 1299706664 is about 1091.3107884700.

The spelling of 1299706664 in words is "one billion, two hundred ninety-nine million, seven hundred six thousand, six hundred sixty-four".