1320388066 has 16 divisors (see below), whose sum is σ = 2015013888. Its totient is φ = 648738000.

The previous prime is 1320388051. The next prime is 1320388087. The reversal of 1320388066 is 6608830231.

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, 135721 + ... + 145123.

It is an arithmetic number, because the mean of its divisors is an integer number (125938368).

Almost surely, 2^1320388066 is an apocalyptic number.

1320388066 is a deficient number, since it is larger than the sum of its proper divisors (694625822).

1320388066 is a wasteful number, since it uses less digits than its factorization.

1320388066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10617.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1320388066 is about 36337.1444392649. The cubic root of 1320388066 is about 1097.0687982841.

The spelling of 1320388066 in words is "one billion, three hundred twenty million, three hundred eighty-eight thousand, sixty-six".