197779545966 has 16 divisors (see below), whose sum is σ = 395563452624. Its totient is φ = 65925788544.

The previous prime is 197779545961. The next prime is 197779545973. The reversal of 197779545966 is 669545977791.

197779545966 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197779545961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953446 + ... + 1142198.

It is an arithmetic number, because the mean of its divisors is an integer number (24722715789).

Almost surely, 2^197779545966 is an apocalyptic number.

197779545966 is an abundant number, since it is smaller than the sum of its proper divisors (197783906658).

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

197779545966 is a wasteful number, since it uses less digits than its factorization.

197779545966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363395.

The product of its digits is 900169200, while the sum is 75.

The spelling of 197779545966 in words is "one hundred ninety-seven billion, seven hundred seventy-nine million, five hundred forty-five thousand, nine hundred sixty-six".