66273157 has 4 divisors (see below), whose sum is σ = 70171596. Its totient is φ = 62374720.

The previous prime is 66273127. The next prime is 66273203. The reversal of 66273157 is 75137266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75137266 = 2 ⋅37568633.

It can be written as a sum of positive squares in 2 ways, for example, as 57972996 + 8300161 = 7614^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 66273157 - 2²³ = 57884549 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 (66273127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1949194 + ... + 1949227.

It is an arithmetic number, because the mean of its divisors is an integer number (17542899).

Almost surely, 2^66273157 is an apocalyptic number.

It is an amenable number.

66273157 is a deficient number, since it is larger than the sum of its proper divisors (3898439).

66273157 is a wasteful number, since it uses less digits than its factorization.

66273157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3898438.

The product of its digits is 52920, while the sum is 37.

The square root of 66273157 is about 8140.8326969666. The cubic root of 66273157 is about 404.6807563969.

It can be divided in two parts, 66273 and 157, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 66273157 in words is "sixty-six million, two hundred seventy-three thousand, one hundred fifty-seven".