1664998334969 has 2 divisors, whose sum is σ = 1664998334970. Its totient is φ = 1664998334968.

The previous prime is 1664998334957. The next prime is 1664998334999. The reversal of 1664998334969 is 9694338994661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965968568569 + 699029766400 = 982837^2 + 836080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664998334969 - 2⁴ = 1664998334953 is a prime.

It is a super-2 number, since 2×1664998334969² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1664998334969.

It is not a weakly prime, because it can be changed into another prime (1664998334999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832499167484 + 832499167485.

It is an arithmetic number, because the mean of its divisors is an integer number (832499167485).

Almost surely, 2^{1664998334969} is an apocalyptic number.

It is an amenable number.

1664998334969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664998334969 is an equidigital number, since it uses as much as digits as its factorization.

1664998334969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632586752, while the sum is 77.

The spelling of 1664998334969 in words is "one trillion, six hundred sixty-four billion, nine hundred ninety-eight million, three hundred thirty-four thousand, nine hundred sixty-nine".