997864663 has 2 divisors, whose sum is σ = 997864664. Its totient is φ = 997864662.

The previous prime is 997864643. The next prime is 997864697. The reversal of 997864663 is 366468799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997864663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997864598 and 997864607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997864613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498932331 + 498932332.

It is an arithmetic number, because the mean of its divisors is an integer number (498932332).

Almost surely, 2^997864663 is an apocalyptic number.

997864663 is a deficient number, since it is larger than the sum of its proper divisors (1).

997864663 is an equidigital number, since it uses as much as digits as its factorization.

997864663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 58.

The square root of 997864663 is about 31588.9959162997. The cubic root of 997864663 is about 999.2877137688.

The spelling of 997864663 in words is "nine hundred ninety-seven million, eight hundred sixty-four thousand, six hundred sixty-three".