1664707970 has 8 divisors (see below), whose sum is σ = 2996474364. Its totient is φ = 665883184.

The previous prime is 1664707969. The next prime is 1664707973. The reversal of 1664707970 is 797074661.

It can be written as a sum of positive squares in 2 ways, for example, as 1585871329 + 78836641 = 39823^2 + 8879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664707973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83235389 + ... + 83235408.

Almost surely, 2^1664707970 is an apocalyptic number.

1664707970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664707970 is a deficient number, since it is larger than the sum of its proper divisors (1331766394).

1664707970 is a wasteful number, since it uses less digits than its factorization.

1664707970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166470804.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 1664707970 is about 40800.8329571836. The cubic root of 1664707970 is about 1185.1664610939.

The spelling of 1664707970 in words is "one billion, six hundred sixty-four million, seven hundred seven thousand, nine hundred seventy".