66158734975204 has 9 divisors (see below), whose sum is σ = 115777814674921. Its totient is φ = 33079359353800.

The previous prime is 66158734975189. The next prime is 66158734975231. The reversal of 66158734975204 is 40257943785166.

The square root of 66158734975204 is 8133802.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 34971871344804 + 31186863630400 = 5913702^2 + 5584520^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66158734975204.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14234154 + ... + 18301054.

It is a 2-persistent number, because it is pandigital, and so is 2⋅66158734975204 = 132317469950408, but 3⋅66158734975204 = 198476204925612 is not.

Almost surely, 2^{66158734975204} is an apocalyptic number.

66158734975204 is the 8133802-nd square number.

It is an amenable number.

66158734975204 is a deficient number, since it is larger than the sum of its proper divisors (49619079699717).

66158734975204 is an frugal number, since it uses more digits than its factorization.

66158734975204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133806 (or 4066903 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 67.

The spelling of 66158734975204 in words is "sixty-six trillion, one hundred fifty-eight billion, seven hundred thirty-four million, nine hundred seventy-five thousand, two hundred four".