163866377 has 4 divisors (see below), whose sum is σ = 168295236. Its totient is φ = 159437520.

The previous prime is 163866361. The next prime is 163866397. The reversal of 163866377 is 773668361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 773668361 = 11383 ⋅67967.

It can be written as a sum of positive squares in 2 ways, for example, as 115369081 + 48497296 = 10741^2 + 6964^2 .

It is a cyclic number.

It is not a de Polignac number, because 163866377 - 2⁴ = 163866361 is a prime.

It is a super-2 number, since 2×163866377² = 53704379022212258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163866347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2214374 + ... + 2214447.

It is an arithmetic number, because the mean of its divisors is an integer number (42073809).

Almost surely, 2^163866377 is an apocalyptic number.

It is an amenable number.

163866377 is a deficient number, since it is larger than the sum of its proper divisors (4428859).

163866377 is an equidigital number, since it uses as much as digits as its factorization.

163866377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428858.

The product of its digits is 762048, while the sum is 47.

The square root of 163866377 is about 12801.0303100961. The cubic root of 163866377 is about 547.2216659673.

The spelling of 163866377 in words is "one hundred sixty-three million, eight hundred sixty-six thousand, three hundred seventy-seven".