997220918361 has 8 divisors (see below), whose sum is σ = 1329701884704. Its totient is φ = 664776948800.

The previous prime is 997220918347. The next prime is 997220918387. The reversal of 997220918361 is 163819022799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997220918361 - 2¹⁵ = 997220885593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997220918341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9186240 + ... + 9294161.

It is an arithmetic number, because the mean of its divisors is an integer number (166212735588).

Almost surely, 2^997220918361 is an apocalyptic number.

It is an amenable number.

997220918361 is a deficient number, since it is larger than the sum of its proper divisors (332480966343).

997220918361 is a wasteful number, since it uses less digits than its factorization.

997220918361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18498391.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 997220918361 in words is "nine hundred ninety-seven billion, two hundred twenty million, nine hundred eighteen thousand, three hundred sixty-one".