66281351 has 8 divisors (see below), whose sum is σ = 70876944. Its totient is φ = 61763200.

The previous prime is 66281339. The next prime is 66281353. The reversal of 66281351 is 15318266.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66281351 - 2⁶ = 66281287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66281353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17585 + ... + 21018.

It is an arithmetic number, because the mean of its divisors is an integer number (8859618).

Almost surely, 2^66281351 is an apocalyptic number.

66281351 is a deficient number, since it is larger than the sum of its proper divisors (4595593).

66281351 is a wasteful number, since it uses less digits than its factorization.

66281351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38721.

The product of its digits is 8640, while the sum is 32.

The square root of 66281351 is about 8141.3359468824. The cubic root of 66281351 is about 404.6974339258.

The spelling of 66281351 in words is "sixty-six million, two hundred eighty-one thousand, three hundred fifty-one".