197607809961 has 27 divisors (see below), whose sum is σ = 289649103133. Its totient is φ = 129820833240.

The previous prime is 197607809941. The next prime is 197607809963. The reversal of 197607809961 is 169908706791.

The square root of 197607809961 is 444531.

It is a perfect power (a square), and thus also a powerful number.

197607809961 is a `hidden beast` number, since 19 + 7 + 607 + 8 + 0 + 9 + 9 + 6 + 1 = 666.

197607809961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197607809961 - 2⁹ = 197607809449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197607809963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 94684060 + ... + 94686146.

Almost surely, 2^197607809961 is an apocalyptic number.

197607809961 is the 444531-st square number.

197607809961 is the 222266-th centered octagonal number.

It is an amenable number.

197607809961 is a deficient number, since it is larger than the sum of its proper divisors (92041293172).

197607809961 is an frugal number, since it uses more digits than its factorization.

197607809961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322 (or 2161 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 63.

The spelling of 197607809961 in words is "one hundred ninety-seven billion, six hundred seven million, eight hundred nine thousand, nine hundred sixty-one".