166461653 has 6 divisors (see below), whose sum is σ = 172400514. Its totient is φ = 160720784.

The previous prime is 166461629. The next prime is 166461667. The reversal of 166461653 is 356164661.

It can be written as a sum of positive squares in 3 ways, for example, as 386884 + 166074769 = 622^2 + 12887^2 .

It is not a de Polignac number, because 166461653 - 2²⁶ = 99352789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166461553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 98126 + ... + 99807.

It is an arithmetic number, because the mean of its divisors is an integer number (28733419).

Almost surely, 2^166461653 is an apocalyptic number.

It is an amenable number.

166461653 is a deficient number, since it is larger than the sum of its proper divisors (5938861).

166461653 is an equidigital number, since it uses as much as digits as its factorization.

166461653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197991 (or 197962 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 166461653 is about 12902.0018989303. The cubic root of 166461653 is about 550.0954688270.

The spelling of 166461653 in words is "one hundred sixty-six million, four hundred sixty-one thousand, six hundred fifty-three".