1664365117291 has 2 divisors, whose sum is σ = 1664365117292. Its totient is φ = 1664365117290.

The previous prime is 1664365117253. The next prime is 1664365117339. The reversal of 1664365117291 is 1927115634661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664365117291 is a prime.

It is a super-2 number, since 2×1664365117291² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1664365117391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832182558645 + 832182558646.

It is an arithmetic number, because the mean of its divisors is an integer number (832182558646).

Almost surely, 2^{1664365117291} is an apocalyptic number.

1664365117291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664365117291 is an equidigital number, since it uses as much as digits as its factorization.

1664365117291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The spelling of 1664365117291 in words is "one trillion, six hundred sixty-four billion, three hundred sixty-five million, one hundred seventeen thousand, two hundred ninety-one".