664671454 has 16 divisors (see below), whose sum is σ = 1001623392. Its totient is φ = 330801408.

The previous prime is 664671431. The next prime is 664671473. The reversal of 664671454 is 454176466.

It is a self number, because there is not a number n which added to its sum of digits gives 664671454.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642922 + ... + 643954.

It is an arithmetic number, because the mean of its divisors is an integer number (62601462).

Almost surely, 2^664671454 is an apocalyptic number.

664671454 is a deficient number, since it is larger than the sum of its proper divisors (336951938).

664671454 is a wasteful number, since it uses less digits than its factorization.

664671454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its digits is 483840, while the sum is 43.

The square root of 664671454 is about 25781.2228957433. Note that the first 3 decimals coincide. The cubic root of 664671454 is about 872.7081044802.

The spelling of 664671454 in words is "six hundred sixty-four million, six hundred seventy-one thousand, four hundred fifty-four".