1638764002597 has 2 divisors, whose sum is σ = 1638764002598. Its totient is φ = 1638764002596.

The previous prime is 1638764002571. The next prime is 1638764002649. The reversal of 1638764002597 is 7952004678361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190889855841 + 447874146756 = 1091279^2 + 669234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1638764002597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638764012597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819382001298 + 819382001299.

It is an arithmetic number, because the mean of its divisors is an integer number (819382001299).

It is a 1-persistent number, because it is pandigital, but 2⋅1638764002597 = 3277528005194 is not.

Almost surely, 2^{1638764002597} is an apocalyptic number.

It is an amenable number.

1638764002597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638764002597 is an equidigital number, since it uses as much as digits as its factorization.

1638764002597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 1638764002597 in words is "one trillion, six hundred thirty-eight billion, seven hundred sixty-four million, two thousand, five hundred ninety-seven".