997001538677 has 2 divisors, whose sum is σ = 997001538678. Its totient is φ = 997001538676.

The previous prime is 997001538671. The next prime is 997001538773. The reversal of 997001538677 is 776835100799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947379075556 + 49622463121 = 973334^2 + 222761^2 .

It is a cyclic number.

It is not a de Polignac number, because 997001538677 - 2²² = 996997344373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997001538671) 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, 498500769338 + 498500769339.

It is an arithmetic number, because the mean of its divisors is an integer number (498500769339).

Almost surely, 2^997001538677 is an apocalyptic number.

It is an amenable number.

997001538677 is a deficient number, since it is larger than the sum of its proper divisors (1).

997001538677 is an equidigital number, since it uses as much as digits as its factorization.

997001538677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20003760, while the sum is 62.

The spelling of 997001538677 in words is "nine hundred ninety-seven billion, one million, five hundred thirty-eight thousand, six hundred seventy-seven".