1664763587109 has 12 divisors (see below), whose sum is σ = 2748181159776. Its totient is φ = 951293478312.

The previous prime is 1664763587041. The next prime is 1664763587111. The reversal of 1664763587109 is 9017853674661.

1664763587109 is a `hidden beast` number, since 1 + 6 + 6 + 47 + 6 + 3 + 587 + 1 + 0 + 9 = 666.

It is not a de Polignac number, because 1664763587109 - 2⁸ = 1664763586853 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 26424818843 = 1664763587109 / (1 + 6 + 6 + 4 + 7 + 6 + 3 + 5 + 8 + 7 + 1 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664763587159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13212409359 + ... + 13212409484.

It is an arithmetic number, because the mean of its divisors is an integer number (229015096648).

Almost surely, 2^{1664763587109} is an apocalyptic number.

It is an amenable number.

1664763587109 is a deficient number, since it is larger than the sum of its proper divisors (1083417572667).

1664763587109 is a wasteful number, since it uses less digits than its factorization.

1664763587109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26424818856 (or 26424818853 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 1664763587109 in words is "one trillion, six hundred sixty-four billion, seven hundred sixty-three million, five hundred eighty-seven thousand, one hundred nine".