1299366816 has 48 divisors (see below), whose sum is σ = 3720917088. Its totient is φ = 393747200.

The previous prime is 1299366791. The next prime is 1299366821. The reversal of 1299366816 is 6186639921.

It is a tau number, because it is divible by the number of its divisors (48).

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, 614175 + ... + 616286.

It is an arithmetic number, because the mean of its divisors is an integer number (77519106).

Almost surely, 2^1299366816 is an apocalyptic number.

1299366816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1299366816 is an abundant number, since it is smaller than the sum of its proper divisors (2421550272).

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

1299366816 is a wasteful number, since it uses less digits than its factorization.

1299366816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230485 (or 1230477 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 1299366816 is about 36046.7310029634. The cubic root of 1299366816 is about 1091.2156613336.

The spelling of 1299366816 in words is "one billion, two hundred ninety-nine million, three hundred sixty-six thousand, eight hundred sixteen".