1664038750417 has 2 divisors, whose sum is σ = 1664038750418. Its totient is φ = 1664038750416.

The previous prime is 1664038750391. The next prime is 1664038750489. The reversal of 1664038750417 is 7140578304661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587791525776 + 76247224641 = 1260076^2 + 276129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664038750417 - 2³¹ = 1661891266769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664038757417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832019375208 + 832019375209.

It is an arithmetic number, because the mean of its divisors is an integer number (832019375209).

Almost surely, 2^{1664038750417} is an apocalyptic number.

It is an amenable number.

1664038750417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664038750417 is an equidigital number, since it uses as much as digits as its factorization.

1664038750417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 1664038750417 in words is "one trillion, six hundred sixty-four billion, thirty-eight million, seven hundred fifty thousand, four hundred seventeen".