197556655791 has 16 divisors (see below), whose sum is σ = 299848838400. Its totient is φ = 114525597120.

The previous prime is 197556655789. The next prime is 197556655843.

197556655791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 197556655791 - 2¹ = 197556655789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197556655781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130141966 + ... + 130143483.

It is an arithmetic number, because the mean of its divisors is an integer number (18740552400).

Almost surely, 2^197556655791 is an apocalyptic number.

197556655791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197556655791 is a deficient number, since it is larger than the sum of its proper divisors (102292182609).

197556655791 is a wasteful number, since it uses less digits than its factorization.

197556655791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260285486.

The product of its digits is 89302500, while the sum is 66.

The spelling of 197556655791 in words is "one hundred ninety-seven billion, five hundred fifty-six million, six hundred fifty-five thousand, seven hundred ninety-one".