1664365117243 has 2 divisors, whose sum is σ = 1664365117244. Its totient is φ = 1664365117242.

The previous prime is 1664365117187. The next prime is 1664365117253. The reversal of 1664365117243 is 3427115634661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664365117243 - 2¹³ = 1664365109051 is a prime.

It is a super-2 number, since 2×1664365117243² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1664365117253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832182558621 + 832182558622.

It is an arithmetic number, because the mean of its divisors is an integer number (832182558622).

Almost surely, 2^{1664365117243} is an apocalyptic number.

1664365117243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664365117243 is an equidigital number, since it uses as much as digits as its factorization.

1664365117243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 49.

The spelling of 1664365117243 in words is "one trillion, six hundred sixty-four billion, three hundred sixty-five million, one hundred seventeen thousand, two hundred forty-three".