1664197254773 has 2 divisors, whose sum is σ = 1664197254774. Its totient is φ = 1664197254772.

The previous prime is 1664197254719. The next prime is 1664197254787. The reversal of 1664197254773 is 3774527914661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1659917870884 + 4279383889 = 1288378^2 + 65417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664197254773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664197254373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832098627386 + 832098627387.

It is an arithmetic number, because the mean of its divisors is an integer number (832098627387).

Almost surely, 2^{1664197254773} is an apocalyptic number.

It is an amenable number.

1664197254773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664197254773 is an equidigital number, since it uses as much as digits as its factorization.

1664197254773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 62.

The spelling of 1664197254773 in words is "one trillion, six hundred sixty-four billion, one hundred ninety-seven million, two hundred fifty-four thousand, seven hundred seventy-three".