997490262577 has 2 divisors, whose sum is σ = 997490262578. Its totient is φ = 997490262576.

The previous prime is 997490262547. The next prime is 997490262661. The reversal of 997490262577 is 775262094799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 854458048161 + 143032214416 = 924369^2 + 378196^2 .

It is an emirp because it is prime and its reverse (775262094799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997490262577 - 2²⁷ = 997356044849 is a prime.

It is not a weakly prime, because it can be changed into another prime (997490262547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498745131288 + 498745131289.

It is an arithmetic number, because the mean of its divisors is an integer number (498745131289).

Almost surely, 2^997490262577 is an apocalyptic number.

It is an amenable number.

997490262577 is a deficient number, since it is larger than the sum of its proper divisors (1).

997490262577 is an equidigital number, since it uses as much as digits as its factorization.

997490262577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 67.

The spelling of 997490262577 in words is "nine hundred ninety-seven billion, four hundred ninety million, two hundred sixty-two thousand, five hundred seventy-seven".