1664320346 has 16 divisors (see below), whose sum is σ = 2713187400. Its totient is φ = 761099328.

The previous prime is 1664320331. The next prime is 1664320351. The reversal of 1664320346 is 6430234661.

It can be written as a sum of positive squares in 4 ways, for example, as 1444836121 + 219484225 = 38011^2 + 14815^2 .

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, 290801 + ... + 296468.

Almost surely, 2^1664320346 is an apocalyptic number.

1664320346 is a deficient number, since it is larger than the sum of its proper divisors (1048867054).

1664320346 is a wasteful number, since it uses less digits than its factorization.

1664320346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587393.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 1664320346 is about 40796.0824834934. The cubic root of 1664320346 is about 1185.0744660546.

It can be divided in two parts, 1664 and 320346, that multiplied together give a square (533055744 = 23088²).

The spelling of 1664320346 in words is "one billion, six hundred sixty-four million, three hundred twenty thousand, three hundred forty-six".