197793397791 has 24 divisors (see below), whose sum is σ = 311688421200. Its totient is φ = 119869411200.

The previous prime is 197793397777. The next prime is 197793397811.

197793397791 is a `hidden beast` number, since 19 + 77 + 93 + 397 + 79 + 1 = 666.

197793397791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 197793397791 - 2⁷ = 197793397663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197793397741) 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, 4119181 + ... + 4166921.

It is an arithmetic number, because the mean of its divisors is an integer number (12987017550).

Almost surely, 2^197793397791 is an apocalyptic number.

197793397791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197793397791 is a deficient number, since it is larger than the sum of its proper divisors (113895023409).

197793397791 is a wasteful number, since it uses less digits than its factorization.

197793397791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89607 (or 89604 counting only the distinct ones).

The product of its digits is 141776649, while the sum is 72.

The spelling of 197793397791 in words is "one hundred ninety-seven billion, seven hundred ninety-three million, three hundred ninety-seven thousand, seven hundred ninety-one".