997361643789 has 18 divisors (see below), whose sum is σ = 1675838953230. Its totient is φ = 569920939056.

The previous prime is 997361643787. The next prime is 997361643793. The reversal of 997361643789 is 987346163799.

997361643789 is a `hidden beast` number, since 9 + 97 + 3 + 6 + 164 + 378 + 9 = 666.

997361643789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 777072221289 + 220289422500 = 881517^2 + 469350^2 .

It is not a de Polignac number, because 997361643789 - 2¹ = 997361643787 is a prime.

It is a super-2 number, since 2×997361643789² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997361643787) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1130795074 + ... + 1130795955.

Almost surely, 2^997361643789 is an apocalyptic number.

It is an amenable number.

997361643789 is a deficient number, since it is larger than the sum of its proper divisors (678477309441).

997361643789 is a wasteful number, since it uses less digits than its factorization.

997361643789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261591049 (or 2261591039 counting only the distinct ones).

The product of its digits is 370355328, while the sum is 72.

The spelling of 997361643789 in words is "nine hundred ninety-seven billion, three hundred sixty-one million, six hundred forty-three thousand, seven hundred eighty-nine".