66274257 has 16 divisors (see below), whose sum is σ = 101184512. Its totient is φ = 37797840.

The previous prime is 66274237. The next prime is 66274301. The reversal of 66274257 is 75247266.

It is a happy number.

It is not a de Polignac number, because 66274257 - 2¹⁵ = 66241489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66274207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9228 + ... + 14754.

It is an arithmetic number, because the mean of its divisors is an integer number (6324032).

Almost surely, 2^66274257 is an apocalyptic number.

It is an amenable number.

66274257 is a deficient number, since it is larger than the sum of its proper divisors (34910255).

66274257 is a wasteful number, since it uses less digits than its factorization.

66274257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108.

The product of its digits is 141120, while the sum is 39.

The square root of 66274257 is about 8140.9002573426. The cubic root of 66274257 is about 404.6829953445.

The spelling of 66274257 in words is "sixty-six million, two hundred seventy-four thousand, two hundred fifty-seven".