997285844164 has 9 divisors (see below), whose sum is σ = 1745253722541. Its totient is φ = 498641923440.

The previous prime is 997285844153. The next prime is 997285844171. The reversal of 997285844164 is 461448582799.

The square root of 997285844164 is 998642.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 290475725764 + 706810118400 = 538958^2 + 840720^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997285844164.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 1747624 + ... + 2246944.

Almost surely, 2^997285844164 is an apocalyptic number.

997285844164 is the 998642-nd square number.

It is an amenable number.

997285844164 is a deficient number, since it is larger than the sum of its proper divisors (747967878377).

997285844164 is an frugal number, since it uses more digits than its factorization.

997285844164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998646 (or 499323 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 67.

It can be divided in two parts, 997285 and 844164, that added together give a square (1841449 = 1357²).

The spelling of 997285844164 in words is "nine hundred ninety-seven billion, two hundred eighty-five million, eight hundred forty-four thousand, one hundred sixty-four".