66273581 has 8 divisors (see below), whose sum is σ = 72382944. Its totient is φ = 60178320.

The previous prime is 66273563. The next prime is 66273587. The reversal of 66273581 is 18537266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66273581 - 2⁶ = 66273517 is a prime.

It is a super-2 number, since 2×66273581² = 8784375077127122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66273587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7946 + ... + 13988.

It is an arithmetic number, because the mean of its divisors is an integer number (9047868).

Almost surely, 2^66273581 is an apocalyptic number.

It is an amenable number.

66273581 is a deficient number, since it is larger than the sum of its proper divisors (6109363).

66273581 is a wasteful number, since it uses less digits than its factorization.

66273581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051.

The product of its digits is 60480, while the sum is 38.

The square root of 66273581 is about 8140.8587384870. The cubic root of 66273581 is about 404.6816194124.

The spelling of 66273581 in words is "sixty-six million, two hundred seventy-three thousand, five hundred eighty-one".