1321660516 has 24 divisors (see below), whose sum is σ = 2527699104. Its totient is φ = 599676480.

The previous prime is 1321660453. The next prime is 1321660517. The reversal of 1321660516 is 6150661231.

It is not an unprimeable number, because it can be changed into a prime (1321660517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905 + ... + 51448.

It is an arithmetic number, because the mean of its divisors is an integer number (105320796).

Almost surely, 2^1321660516 is an apocalyptic number.

It is an amenable number.

1321660516 is a deficient number, since it is larger than the sum of its proper divisors (1206038588).

1321660516 is a wasteful number, since it uses less digits than its factorization.

1321660516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53931 (or 53929 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1321660516 is about 36354.6491662346. The cubic root of 1321660516 is about 1097.4210979957.

The spelling of 1321660516 in words is "one billion, three hundred twenty-one million, six hundred sixty thousand, five hundred sixteen".