66328251 has 32 divisors (see below), whose sum is σ = 103956480. Its totient is φ = 37197600.

The previous prime is 66328217. The next prime is 66328253. The reversal of 66328251 is 15282366.

It is not a de Polignac number, because 66328251 - 2⁶ = 66328187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66328253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22120 + ... + 24938.

It is an arithmetic number, because the mean of its divisors is an integer number (3248640).

Almost surely, 2^66328251 is an apocalyptic number.

66328251 is a deficient number, since it is larger than the sum of its proper divisors (37628229).

66328251 is a wasteful number, since it uses less digits than its factorization.

66328251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its digits is 17280, while the sum is 33.

The square root of 66328251 is about 8144.2158001860. The cubic root of 66328251 is about 404.7928646634.

The spelling of 66328251 in words is "sixty-six million, three hundred twenty-eight thousand, two hundred fifty-one".