1664909386 has 32 divisors (see below), whose sum is σ = 2932473600. Its totient is φ = 694051200.

The previous prime is 1664909369. The next prime is 1664909413. The reversal of 1664909386 is 6839094661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196171 + ... + 204481.

It is an arithmetic number, because the mean of its divisors is an integer number (91639800).

Almost surely, 2^1664909386 is an apocalyptic number.

1664909386 is a deficient number, since it is larger than the sum of its proper divisors (1267564214).

1664909386 is a wasteful number, since it uses less digits than its factorization.

1664909386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The square root of 1664909386 is about 40803.3011654694. The cubic root of 1664909386 is about 1185.2142576375.

The spelling of 1664909386 in words is "one billion, six hundred sixty-four million, nine hundred nine thousand, three hundred eighty-six".