1664159509187 has 48 divisors (see below), whose sum is σ = 2032087698432. Its totient is φ = 1356281055360.

The previous prime is 1664159509171. The next prime is 1664159509189. The reversal of 1664159509187 is 7819059514661.

It is not a de Polignac number, because 1664159509187 - 2⁴ = 1664159509171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664159509189) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139569608 + ... + 139581530.

It is an arithmetic number, because the mean of its divisors is an integer number (42335160384).

Almost surely, 2^{1664159509187} is an apocalyptic number.

1664159509187 is a deficient number, since it is larger than the sum of its proper divisors (367928189245).

1664159509187 is a wasteful number, since it uses less digits than its factorization.

1664159509187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12688 (or 12681 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 62.

The spelling of 1664159509187 in words is "one trillion, six hundred sixty-four billion, one hundred fifty-nine million, five hundred nine thousand, one hundred eighty-seven".