1299663840784 has 15 divisors (see below), whose sum is σ = 2518107526767. Its totient is φ = 649829640336.

The previous prime is 1299663840773. The next prime is 1299663840823. The reversal of 1299663840784 is 4870483669921.

The square root of 1299663840784 is 1140028.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4417609 + ... + 4702615.

Almost surely, 2^{1299663840784} is an apocalyptic number.

1299663840784 is the 1140028-th square number.

It is an amenable number.

1299663840784 is a deficient number, since it is larger than the sum of its proper divisors (1218443685983).

1299663840784 is an frugal number, since it uses more digits than its factorization.

1299663840784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570022 (or 285009 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 67.

The spelling of 1299663840784 in words is "one trillion, two hundred ninety-nine billion, six hundred sixty-three million, eight hundred forty thousand, seven hundred eighty-four".