166466381877 has 12 divisors (see below), whose sum is σ = 249357049760. Its totient is φ = 110977587756.

The previous prime is 166466381869. The next prime is 166466381881. The reversal of 166466381877 is 778183664661.

It is a happy number.

166466381877 is a `hidden beast` number, since 1 + 66 + 466 + 38 + 1 + 87 + 7 = 666.

It is not a de Polignac number, because 166466381877 - 2³ = 166466381869 is a prime.

It is a super-2 number, since 2×166466381877² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166466381857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 342523177 + ... + 342523662.

Almost surely, 2^166466381877 is an apocalyptic number.

It is an amenable number.

166466381877 is a deficient number, since it is larger than the sum of its proper divisors (82890667883).

166466381877 is an frugal number, since it uses more digits than its factorization.

166466381877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685046854 (or 685046842 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 166466381877 in words is "one hundred sixty-six billion, four hundred sixty-six million, three hundred eighty-one thousand, eight hundred seventy-seven".