1664806995076 has 9 divisors (see below), whose sum is σ = 2913416757349. Its totient is φ = 832402207264.

The previous prime is 1664806995037. The next prime is 1664806995083. The reversal of 1664806995076 is 6705996084661.

The square root of 1664806995076 is 1290274.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 124785562500 + 1540021432576 = 353250^2 + 1240976^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2257980 + ... + 2903116.

Almost surely, 2^{1664806995076} is an apocalyptic number.

1664806995076 is the 1290274-th square number.

It is an amenable number.

1664806995076 is a deficient number, since it is larger than the sum of its proper divisors (1248609762273).

1664806995076 is an frugal number, since it uses more digits than its factorization.

1664806995076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290278 (or 645139 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 67.

The spelling of 1664806995076 in words is "one trillion, six hundred sixty-four billion, eight hundred six million, nine hundred ninety-five thousand, seventy-six".