451661423 has 4 divisors (see below), whose sum is σ = 478229760. Its totient is φ = 425093088.

The previous prime is 451661401. The next prime is 451661443. The reversal of 451661423 is 324166154.

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 451661423 - 2⁶ = 451661359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 451661423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451661443) 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, 13284143 + ... + 13284176.

It is an arithmetic number, because the mean of its divisors is an integer number (119557440).

Almost surely, 2^451661423 is an apocalyptic number.

451661423 is a deficient number, since it is larger than the sum of its proper divisors (26568337).

451661423 is a wasteful number, since it uses less digits than its factorization.

451661423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26568336.

The product of its digits is 17280, while the sum is 32.

The square root of 451661423 is about 21252.3274725382. The cubic root of 451661423 is about 767.2513586600.

The spelling of 451661423 in words is "four hundred fifty-one million, six hundred sixty-one thousand, four hundred twenty-three".