66451 has 8 divisors (see below), whose sum is σ = 82944. Its totient is φ = 51720.

The previous prime is 66449. The next prime is 66457. The reversal of 66451 is 15466.

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 66451 - 2¹ = 66449 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (66457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355 + ... + 508.

It is an arithmetic number, because the mean of its divisors is an integer number (10368).

2⁶⁶⁴⁵¹ is an apocalyptic number.

66451 is a deficient number, since it is larger than the sum of its proper divisors (16493).

66451 is a wasteful number, since it uses less digits than its factorization.

66451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its digits is 720, while the sum is 22.

The square root of 66451 is about 257.7809147319. The cubic root of 66451 is about 40.5042417952.

The spelling of 66451 in words is "sixty-six thousand, four hundred fifty-one".