66874553 has 4 divisors (see below), whose sum is σ = 68008080. Its totient is φ = 65741028.

The previous prime is 66874541. The next prime is 66874559. The reversal of 66874553 is 35547866.

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 66874553 - 2⁴ = 66874537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66874559) 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, 566675 + ... + 566792.

It is an arithmetic number, because the mean of its divisors is an integer number (17002020).

Almost surely, 2^66874553 is an apocalyptic number.

It is an amenable number.

66874553 is a deficient number, since it is larger than the sum of its proper divisors (1133527).

66874553 is a wasteful number, since it uses less digits than its factorization.

66874553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133526.

The product of its digits is 604800, while the sum is 44.

The square root of 66874553 is about 8177.6862864749. The cubic root of 66874553 is about 405.9011645980.

The spelling of 66874553 in words is "sixty-six million, eight hundred seventy-four thousand, five hundred fifty-three".