166666365 has 24 divisors (see below), whose sum is σ = 289200600. Its totient is φ = 88792704.

The previous prime is 166666301. The next prime is 166666399. The reversal of 166666365 is 563666661.

It can be written as a sum of positive squares in 4 ways, for example, as 100520676 + 66145689 = 10026^2 + 8133^2 .

It is not a de Polignac number, because 166666365 - 2⁶ = 166666301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 166666365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64111 + ... + 66659.

It is an arithmetic number, because the mean of its divisors is an integer number (12050025).

Almost surely, 2^166666365 is an apocalyptic number.

166666365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166666365 is a deficient number, since it is larger than the sum of its proper divisors (122534235).

166666365 is a wasteful number, since it uses less digits than its factorization.

166666365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013 (or 4010 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 166666365 is about 12909.9328038530. The cubic root of 166666365 is about 550.3208761218.

The spelling of 166666365 in words is "one hundred sixty-six million, six hundred sixty-six thousand, three hundred sixty-five".