166386747 has 4 divisors (see below), whose sum is σ = 221849000. Its totient is φ = 110924496.

The previous prime is 166386709. The next prime is 166386751. The reversal of 166386747 is 747683661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166386747 - 2¹² = 166382651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166386696 and 166386705.

It is not an unprimeable number, because it can be changed into a prime (166386757) 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 3 ways as a sum of consecutive naturals, for example, 27731122 + ... + 27731127.

It is an arithmetic number, because the mean of its divisors is an integer number (55462250).

Almost surely, 2^166386747 is an apocalyptic number.

166386747 is a deficient number, since it is larger than the sum of its proper divisors (55462253).

166386747 is an equidigital number, since it uses as much as digits as its factorization.

166386747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55462252.

The product of its digits is 1016064, while the sum is 48.

The square root of 166386747 is about 12899.0986894434. The cubic root of 166386747 is about 550.0129440480.

It can be divided in two parts, 1663 and 86747, that added together give a triangular number (88410 = T₄₂₀).

The spelling of 166386747 in words is "one hundred sixty-six million, three hundred eighty-six thousand, seven hundred forty-seven".