66504653 has 4 divisors (see below), whose sum is σ = 66745020. Its totient is φ = 66264288.

The previous prime is 66504637. The next prime is 66504667. The reversal of 66504653 is 35640566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9320809 + 57183844 = 3053^2 + 7562^2 .

It is a cyclic number.

It is not a de Polignac number, because 66504653 - 2⁴ = 66504637 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 (66504253) 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, 119768 + ... + 120321.

It is an arithmetic number, because the mean of its divisors is an integer number (16686255).

Almost surely, 2^66504653 is an apocalyptic number.

It is an amenable number.

66504653 is a deficient number, since it is larger than the sum of its proper divisors (240367).

66504653 is a wasteful number, since it uses less digits than its factorization.

66504653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240366.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66504653 is about 8155.0385038944. The cubic root of 66504653 is about 405.1513999824.

The spelling of 66504653 in words is "sixty-six million, five hundred four thousand, six hundred fifty-three".