66540269 has 4 divisors (see below), whose sum is σ = 66564960. Its totient is φ = 66515580.

The previous prime is 66540263. The next prime is 66540289. The reversal of 66540269 is 96204566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66540269 - 2⁸ = 66540013 is a prime.

It is a super-2 number, since 2×66540269² = 8855214797184722, 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 (66540263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7727 + ... + 13884.

It is an arithmetic number, because the mean of its divisors is an integer number (16641240).

Almost surely, 2^66540269 is an apocalyptic number.

It is an amenable number.

66540269 is a deficient number, since it is larger than the sum of its proper divisors (24691).

66540269 is a wasteful number, since it uses less digits than its factorization.

66540269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24690.

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

The square root of 66540269 is about 8157.2218922866. The cubic root of 66540269 is about 405.2237122014.

The spelling of 66540269 in words is "sixty-six million, five hundred forty thousand, two hundred sixty-nine".