166776775266 has 64 divisors (see below), whose sum is σ = 375310817280. Its totient is φ = 49147781760.

The previous prime is 166776775261. The next prime is 166776775271. The reversal of 166776775266 is 662577677661.

It is an interprime number because it is at equal distance from previous prime (166776775261) and next prime (166776775271).

It is a junction number, because it is equal to n+sod(n) for n = 166776775197 and 166776775206.

It is not an unprimeable number, because it can be changed into a prime (166776775261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 668190 + ... + 883193.

It is an arithmetic number, because the mean of its divisors is an integer number (5864231520).

Almost surely, 2^166776775266 is an apocalyptic number.

166776775266 is an abundant number, since it is smaller than the sum of its proper divisors (208534042014).

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

166776775266 is a wasteful number, since it uses less digits than its factorization.

166776775266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551471.

The product of its digits is 186701760, while the sum is 66.

The spelling of 166776775266 in words is "one hundred sixty-six billion, seven hundred seventy-six million, seven hundred seventy-five thousand, two hundred sixty-six".