166666525 has 12 divisors (see below), whose sum is σ = 208498932. Its totient is φ = 132151040.

The previous prime is 166666481. The next prime is 166666547. The reversal of 166666525 is 525666661.

It can be written as a sum of positive squares in 6 ways, for example, as 31595641 + 135070884 = 5621^2 + 11622^2 .

It is not a de Polignac number, because 166666525 - 2¹³ = 166658333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26674 + ... + 32323.

It is an arithmetic number, because the mean of its divisors is an integer number (17374911).

Almost surely, 2^166666525 is an apocalyptic number.

It is an amenable number.

166666525 is a deficient number, since it is larger than the sum of its proper divisors (41832407).

166666525 is a wasteful number, since it uses less digits than its factorization.

166666525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59120 (or 59115 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 166666525 is about 12909.9390006305. The cubic root of 166666525 is about 550.3210522247.

The spelling of 166666525 in words is "one hundred sixty-six million, six hundred sixty-six thousand, five hundred twenty-five".