166556377 has 8 divisors (see below), whose sum is σ = 179945864. Its totient is φ = 153249408.

The previous prime is 166556371. The next prime is 166556387. The reversal of 166556377 is 773655661.

It can be written as a sum of positive squares in 4 ways, for example, as 11703241 + 154853136 = 3421^2 + 12444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166556377 - 2⁷ = 166556249 is a prime.

It is a super-2 number, since 2×166556377² = 55482053438732258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166556371) 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 7 ways as a sum of consecutive naturals, for example, 16398 + ... + 24535.

It is an arithmetic number, because the mean of its divisors is an integer number (22493233).

Almost surely, 2^166556377 is an apocalyptic number.

It is an amenable number.

166556377 is a deficient number, since it is larger than the sum of its proper divisors (13389487).

166556377 is a wasteful number, since it uses less digits than its factorization.

166556377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41259.

The product of its digits is 793800, while the sum is 46.

The square root of 166556377 is about 12905.6722800480. The cubic root of 166556377 is about 550.1997918780.

It can be divided in two parts, 16655 and 6377, that added together give a palindrome (23032).

The spelling of 166556377 in words is "one hundred sixty-six million, five hundred fifty-six thousand, three hundred seventy-seven".