451663651 has 4 divisors (see below), whose sum is σ = 451793704. Its totient is φ = 451533600.

The previous prime is 451663637. The next prime is 451663657. The reversal of 451663651 is 156366154.

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 451663651 - 2⁷ = 451663523 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 451663651.

It is not an unprimeable number, because it can be changed into a prime (451663657) 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, 59670 + ... + 66811.

It is an arithmetic number, because the mean of its divisors is an integer number (112948426).

Almost surely, 2^451663651 is an apocalyptic number.

451663651 is a deficient number, since it is larger than the sum of its proper divisors (130053).

451663651 is a wasteful number, since it uses less digits than its factorization.

451663651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130052.

The product of its digits is 64800, while the sum is 37.

The square root of 451663651 is about 21252.3798902617. The cubic root of 451663651 is about 767.2526202490.

The spelling of 451663651 in words is "four hundred fifty-one million, six hundred sixty-three thousand, six hundred fifty-one".