197878424878791 has 24 divisors (see below), whose sum is σ = 300879184320000. Its totient is φ = 124971110327952.

The previous prime is 197878424878703. The next prime is 197878424878807.

197878424878791 is a `hidden beast` number, since 1 + 9 + 7 + 8 + 7 + 8 + 42 + 487 + 87 + 9 + 1 = 666.

197878424878791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 197878424878791 - 2⁹ = 197878424878279 is a prime.

It is a super-2 number, since 2×197878424878791² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197878424878391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17402961 + ... + 26431418.

It is an arithmetic number, because the mean of its divisors is an integer number (12536632680000).

Almost surely, 2^{197878424878791} is an apocalyptic number.

197878424878791 is a deficient number, since it is larger than the sum of its proper divisors (103000759441209).

197878424878791 is a wasteful number, since it uses less digits than its factorization.

197878424878791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43860803 (or 43860800 counting only the distinct ones).

The product of its digits is 25491013632, while the sum is 90.

The spelling of 197878424878791 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-one".