1664605745002 has 16 divisors (see below), whose sum is σ = 2561187798792. Its totient is φ = 810930113280.

The previous prime is 1664605744981. The next prime is 1664605745039. The reversal of 1664605745002 is 2005475064661.

It can be written as a sum of positive squares in 4 ways, for example, as 1432165086361 + 232440658641 = 1196731^2 + 482121^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13346163 + ... + 13470310.

Almost surely, 2^{1664605745002} is an apocalyptic number.

1664605745002 is a deficient number, since it is larger than the sum of its proper divisors (896582053790).

1664605745002 is a wasteful number, since it uses less digits than its factorization.

1664605745002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26817273.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 1664605745002 in words is "one trillion, six hundred sixty-four billion, six hundred five million, seven hundred forty-five thousand, two".