997622978137 has 2 divisors, whose sum is σ = 997622978138. Its totient is φ = 997622978136.

The previous prime is 997622978083. The next prime is 997622978159. The reversal of 997622978137 is 731879226799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 936596192841 + 61026785296 = 967779^2 + 247036^2 .

It is a cyclic number.

It is not a de Polignac number, because 997622978137 - 2¹¹ = 997622976089 is a prime.

It is not a weakly prime, because it can be changed into another prime (997622975137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498811489068 + 498811489069.

It is an arithmetic number, because the mean of its divisors is an integer number (498811489069).

Almost surely, 2^997622978137 is an apocalyptic number.

It is an amenable number.

997622978137 is a deficient number, since it is larger than the sum of its proper divisors (1).

997622978137 is an equidigital number, since it uses as much as digits as its factorization.

997622978137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144027072, while the sum is 70.

The spelling of 997622978137 in words is "nine hundred ninety-seven billion, six hundred twenty-two million, nine hundred seventy-eight thousand, one hundred thirty-seven".