1638236407097 has 2 divisors, whose sum is σ = 1638236407098. Its totient is φ = 1638236407096.

The previous prime is 1638236407061. The next prime is 1638236407111. The reversal of 1638236407097 is 7907046328361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1583208161536 + 55028245561 = 1258256^2 + 234581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1638236407097 - 2⁸ = 1638236406841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638236406097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819118203548 + 819118203549.

It is an arithmetic number, because the mean of its divisors is an integer number (819118203549).

Almost surely, 2^{1638236407097} is an apocalyptic number.

It is an amenable number.

1638236407097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638236407097 is an equidigital number, since it uses as much as digits as its factorization.

1638236407097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 1638236407097 in words is "one trillion, six hundred thirty-eight billion, two hundred thirty-six million, four hundred seven thousand, ninety-seven".