66544251 has 8 divisors (see below), whose sum is σ = 93395520. Its totient is φ = 42027912.

The previous prime is 66544237. The next prime is 66544279. The reversal of 66544251 is 15244566.

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

It is not a de Polignac number, because 66544251 - 2⁶ = 66544187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66544211) 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, 583665 + ... + 583778.

It is an arithmetic number, because the mean of its divisors is an integer number (11674440).

Almost surely, 2^66544251 is an apocalyptic number.

66544251 is a deficient number, since it is larger than the sum of its proper divisors (26851269).

66544251 is a wasteful number, since it uses less digits than its factorization.

66544251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167465.

The product of its digits is 28800, while the sum is 33.

The square root of 66544251 is about 8157.4659668306. The cubic root of 66544251 is about 405.2317953700.

It can be divided in two parts, 66544 and 251, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 66544251 in words is "sixty-six million, five hundred forty-four thousand, two hundred fifty-one".