75166108285921 has 9 divisors (see below), whose sum is σ = 75218293565779. Its totient is φ = 75113959204336.

The previous prime is 75166108285901. The next prime is 75166108285927. The reversal of 75166108285921 is 12958280166157.

It is a happy number.

The square root of 75166108285921 is 8669839.

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., 1562337504225 + 73603770781696 = 1249935^2 + 8579264^2 .

It is not a de Polignac number, because 75166108285921 - 2²¹ = 75166106188769 is a prime.

It is a super-2 number, since 2×75166108285921² (a number of 29 digits) contains 22 as substring.

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 75166108285921.

It is not an unprimeable number, because it can be changed into a prime (75166108285927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20746922916 + ... + 20746926538.

Almost surely, 2^{75166108285921} is an apocalyptic number.

75166108285921 is the 8669839-th square number.

75166108285921 is the 4334920-th centered octagonal number.

It is an amenable number.

75166108285921 is a deficient number, since it is larger than the sum of its proper divisors (52185279858).

75166108285921 is an frugal number, since it uses more digits than its factorization.

75166108285921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12032 (or 6016 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 61.

The spelling of 75166108285921 in words is "seventy-five trillion, one hundred sixty-six billion, one hundred eight million, two hundred eighty-five thousand, nine hundred twenty-one".