1664889100973 has 32 divisors (see below), whose sum is σ = 2063687141376. Its totient is φ = 1312108573248.

The previous prime is 1664889100939. The next prime is 1664889100981. The reversal of 1664889100973 is 3790019884661.

It is a cyclic number.

It is not a de Polignac number, because 1664889100973 - 2¹⁰ = 1664889099949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664889100933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1189211 + ... + 2178072.

It is an arithmetic number, because the mean of its divisors is an integer number (64490223168).

Almost surely, 2^{1664889100973} is an apocalyptic number.

It is an amenable number.

1664889100973 is a deficient number, since it is larger than the sum of its proper divisors (398798040403).

1664889100973 is a wasteful number, since it uses less digits than its factorization.

1664889100973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367433.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 1664889100973 in words is "one trillion, six hundred sixty-four billion, eight hundred eighty-nine million, one hundred thousand, nine hundred seventy-three".