66274775 has 12 divisors (see below), whose sum is σ = 93921072. Its totient is φ = 45445440.

The previous prime is 66274723. The next prime is 66274787. The reversal of 66274775 is 57747266.

It is not a de Polignac number, because 66274775 - 2⁶ = 66274711 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 189182 + ... + 189531.

It is an arithmetic number, because the mean of its divisors is an integer number (7826756).

Almost surely, 2^66274775 is an apocalyptic number.

66274775 is a deficient number, since it is larger than the sum of its proper divisors (27646297).

66274775 is a wasteful number, since it uses less digits than its factorization.

66274775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378730 (or 378725 counting only the distinct ones).

The product of its digits is 493920, while the sum is 44.

The square root of 66274775 is about 8140.9320719436. The cubic root of 66274775 is about 404.6840496767.

The spelling of 66274775 in words is "sixty-six million, two hundred seventy-four thousand, seven hundred seventy-five".