997776383677798 has 16 divisors (see below), whose sum is σ = 1496784019427136. Its totient is φ = 498848378840680.

The previous prime is 997776383677673. The next prime is 997776383677861. The reversal of 997776383677798 is 897776383677799.

It is a junction number, because it is equal to n+sod(n) for n = 997776383677697 and 997776383677706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298257665 + ... + 1299025987.

It is an arithmetic number, because the mean of its divisors is an integer number (93549001214196).

Almost surely, 2^{997776383677798} is an apocalyptic number.

997776383677798 is a deficient number, since it is larger than the sum of its proper divisors (499007635749338).

997776383677798 is a wasteful number, since it uses less digits than its factorization.

997776383677798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819299.

The product of its digits is 1778446285056, while the sum is 103.

Subtracting from 997776383677798 its reverse (897776383677799), we obtain a palindrome (99999999999999).

The spelling of 997776383677798 in words is "nine hundred ninety-seven trillion, seven hundred seventy-six billion, three hundred eighty-three million, six hundred seventy-seven thousand, seven hundred ninety-eight".