1326506289397 has 2 divisors, whose sum is σ = 1326506289398. Its totient is φ = 1326506289396.

The previous prime is 1326506289389. The next prime is 1326506289403. The reversal of 1326506289397 is 7939826056231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1262805072516 + 63701216881 = 1123746^2 + 252391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326506289397 - 2³ = 1326506289389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1326506289377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663253144698 + 663253144699.

It is an arithmetic number, because the mean of its divisors is an integer number (663253144699).

Almost surely, 2^{1326506289397} is an apocalyptic number.

It is an amenable number.

1326506289397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326506289397 is an equidigital number, since it uses as much as digits as its factorization.

1326506289397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 1326506289397 in words is "one trillion, three hundred twenty-six billion, five hundred six million, two hundred eighty-nine thousand, three hundred ninety-seven".