997884183861 has 24 divisors (see below), whose sum is σ = 1490114225600. Its totient is φ = 643086210816.

The previous prime is 997884183853. The next prime is 997884183889. The reversal of 997884183861 is 168381488799.

997884183861 is a `hidden beast` number, since 99 + 78 + 84 + 18 + 386 + 1 = 666.

It is not a de Polignac number, because 997884183861 - 2³ = 997884183853 is a prime.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 997884183861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997884183851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13253761 + ... + 13328838.

Almost surely, 2^997884183861 is an apocalyptic number.

It is an amenable number.

997884183861 is a deficient number, since it is larger than the sum of its proper divisors (492230041739).

997884183861 is a wasteful number, since it uses less digits than its factorization.

997884183861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26582745 (or 26582742 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 72.

The spelling of 997884183861 in words is "nine hundred ninety-seven billion, eight hundred eighty-four million, one hundred eighty-three thousand, eight hundred sixty-one".