1664998334997 has 4 divisors (see below), whose sum is σ = 2219997780000. Its totient is φ = 1109998889996.

The previous prime is 1664998334969. The next prime is 1664998334999. The reversal of 1664998334997 is 7994338994661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1664998334997 - 2⁷ = 1664998334869 is a prime.

It is a super-3 number, since 3×1664998334997³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664998334999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277499722497 + ... + 277499722502.

It is an arithmetic number, because the mean of its divisors is an integer number (554999445000).

Almost surely, 2^{1664998334997} is an apocalyptic number.

It is an amenable number.

1664998334997 is a deficient number, since it is larger than the sum of its proper divisors (554999445003).

1664998334997 is an equidigital number, since it uses as much as digits as its factorization.

1664998334997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554999445002.

The product of its digits is 1904684544, while the sum is 78.

The spelling of 1664998334997 in words is "one trillion, six hundred sixty-four billion, nine hundred ninety-eight million, three hundred thirty-four thousand, nine hundred ninety-seven".