1664312386 has 16 divisors (see below), whose sum is σ = 2725086240. Its totient is φ = 756042880.

The previous prime is 1664312381. The next prime is 1664312399. The reversal of 1664312386 is 6832134661.

It is not an unprimeable number, because it can be changed into a prime (1664312381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15045 + ... + 59623.

It is an arithmetic number, because the mean of its divisors is an integer number (170317890).

Almost surely, 2^1664312386 is an apocalyptic number.

1664312386 is a deficient number, since it is larger than the sum of its proper divisors (1060773854).

1664312386 is a wasteful number, since it uses less digits than its factorization.

1664312386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46289.

The product of its digits is 124416, while the sum is 40.

The square root of 1664312386 is about 40795.9849249899. The cubic root of 1664312386 is about 1185.0725767533.

The spelling of 1664312386 in words is "one billion, six hundred sixty-four million, three hundred twelve thousand, three hundred eighty-six".