663451 has 4 divisors (see below), whose sum is σ = 665152. Its totient is φ = 661752.

The previous prime is 663437. The next prime is 663463. The reversal of 663451 is 154366.

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 663451 - 2⁹ = 662939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669451) 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, 61 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (166288).

2⁶⁶³⁴⁵¹ is an apocalyptic number.

663451 is a deficient number, since it is larger than the sum of its proper divisors (1701).

663451 is a wasteful number, since it uses less digits than its factorization.

663451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its digits is 2160, while the sum is 25.

The square root of 663451 is about 814.5250149627. The cubic root of 663451 is about 87.2173628557.

The spelling of 663451 in words is "six hundred sixty-three thousand, four hundred fifty-one".