1320691866 has 16 divisors (see below), whose sum is σ = 2844567264. Its totient is φ = 406366704.

The previous prime is 1320691849. The next prime is 1320691913. The reversal of 1320691866 is 6681960231.

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, 8465896 + ... + 8466051.

It is an arithmetic number, because the mean of its divisors is an integer number (177785454).

Almost surely, 2^1320691866 is an apocalyptic number.

1320691866 is an abundant number, since it is smaller than the sum of its proper divisors (1523875398).

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

1320691866 is a wasteful number, since it uses less digits than its factorization.

1320691866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16931965.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 1320691866 is about 36341.3244942999. The cubic root of 1320691866 is about 1097.1529311112.

The spelling of 1320691866 in words is "one billion, three hundred twenty million, six hundred ninety-one thousand, eight hundred sixty-six".