660451 has 4 divisors (see below), whose sum is σ = 720504. Its totient is φ = 600400.

The previous prime is 660449. The next prime is 660493. The reversal of 660451 is 154066.

660451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660451 - 2¹ = 660449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30010 + ... + 30031.

It is an arithmetic number, because the mean of its divisors is an integer number (180126).

2⁶⁶⁰⁴⁵¹ is an apocalyptic number.

660451 is a deficient number, since it is larger than the sum of its proper divisors (60053).

660451 is a wasteful number, since it uses less digits than its factorization.

660451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60052.

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

The square root of 660451 is about 812.6813643735. The cubic root of 660451 is about 87.0857040682.

It can be divided in two parts, 660 and 451, that added together give a palindrome (1111).

The spelling of 660451 in words is "six hundred sixty thousand, four hundred fifty-one".