66274779 has 8 divisors (see below), whose sum is σ = 88855312. Its totient is φ = 43938720.

The previous prime is 66274723. The next prime is 66274787. The reversal of 66274779 is 97747266.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-66274779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66274379) 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 7 ways as a sum of consecutive naturals, for example, 60484 + ... + 61569.

It is an arithmetic number, because the mean of its divisors is an integer number (11106914).

Almost surely, 2^66274779 is an apocalyptic number.

66274779 is a deficient number, since it is larger than the sum of its proper divisors (22580533).

66274779 is a wasteful number, since it uses less digits than its factorization.

66274779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122237.

The product of its digits is 889056, while the sum is 48.

The square root of 66274779 is about 8140.9323176157. The cubic root of 66274779 is about 404.6840578182.

The spelling of 66274779 in words is "sixty-six million, two hundred seventy-four thousand, seven hundred seventy-nine".