166722672533 has 4 divisors (see below), whose sum is σ = 166850823468. Its totient is φ = 166594521600.

The previous prime is 166722672521. The next prime is 166722672551. The reversal of 166722672533 is 335276227661.

It is a happy number.

166722672533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335276227661 = 61 ⋅5496331601.

It can be written as a sum of positive squares in 2 ways, for example, as 18742431409 + 147980241124 = 136903^2 + 384682^2 .

It is a cyclic number.

It is not a de Polignac number, because 166722672533 - 2³⁴ = 149542803349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166722672503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64073516 + ... + 64076117.

It is an arithmetic number, because the mean of its divisors is an integer number (41712705867).

Almost surely, 2^166722672533 is an apocalyptic number.

It is an amenable number.

166722672533 is a deficient number, since it is larger than the sum of its proper divisors (128150935).

166722672533 is a wasteful number, since it uses less digits than its factorization.

166722672533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128150934.

The product of its digits is 3810240, while the sum is 50.

The spelling of 166722672533 in words is "one hundred sixty-six billion, seven hundred twenty-two million, six hundred seventy-two thousand, five hundred thirty-three".