997894269657 has 24 divisors (see below), whose sum is σ = 1530035639496. Its totient is φ = 624552546816.

The previous prime is 997894269653. The next prime is 997894269677. The reversal of 997894269657 is 756962498799.

It can be written as a sum of positive squares in 4 ways, for example, as 232892142921 + 765002126736 = 482589^2 + 874644^2 .

It is not a de Polignac number, because 997894269657 - 2² = 997894269653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997894269653) 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 in 23 ways as a sum of consecutive naturals, for example, 8153598 + ... + 8275079.

It is an arithmetic number, because the mean of its divisors is an integer number (63751484979).

Almost surely, 2^997894269657 is an apocalyptic number.

It is an amenable number.

997894269657 is a deficient number, since it is larger than the sum of its proper divisors (532141369839).

997894269657 is a wasteful number, since it uses less digits than its factorization.

997894269657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16429097 (or 16429094 counting only the distinct ones).

The product of its digits is 3703553280, while the sum is 81.

The spelling of 997894269657 in words is "nine hundred ninety-seven billion, eight hundred ninety-four million, two hundred sixty-nine thousand, six hundred fifty-seven".