197878424878792 has 48 divisors (see below), whose sum is σ = 437509363429260. Its totient is φ = 83643326355456.

The previous prime is 197878424878703. The next prime is 197878424878807. The reversal of 197878424878792 is 297878424878791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 195870269473956 + 2008155404836 = 13995366^2 + 1417094^2 .

It is a junction number, because it is equal to n+sod(n) for n = 197878424878697 and 197878424878706.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3457450153 + ... + 3457507384.

Almost surely, 2^{197878424878792} is an apocalyptic number.

It is an amenable number.

197878424878792 is an abundant number, since it is smaller than the sum of its proper divisors (239630938550468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197878424878792 is a wasteful number, since it uses less digits than its factorization.

197878424878792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6914957630 (or 6914957619 counting only the distinct ones).

The product of its digits is 50982027264, while the sum is 91.

Subtracting 197878424878792 from its reverse (297878424878791), we obtain a palindrome (99999999999999).

The spelling of 197878424878792 in words is "one hundred ninety-seven trillion, eight hundred seventy-eight billion, four hundred twenty-four million, eight hundred seventy-eight thousand, seven hundred ninety-two".