664725455 has 4 divisors (see below), whose sum is σ = 797670552. Its totient is φ = 531780360.

The previous prime is 664725421. The next prime is 664725473. The reversal of 664725455 is 554527466.

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

It is not a de Polignac number, because 664725455 - 2¹² = 664721359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66472541 + ... + 66472550.

It is an arithmetic number, because the mean of its divisors is an integer number (199417638).

Almost surely, 2^664725455 is an apocalyptic number.

664725455 is a deficient number, since it is larger than the sum of its proper divisors (132945097).

664725455 is a wasteful number, since it uses less digits than its factorization.

664725455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132945096.

The product of its digits is 1008000, while the sum is 44.

The square root of 664725455 is about 25782.2701676947. The cubic root of 664725455 is about 872.7317381285.

The spelling of 664725455 in words is "six hundred sixty-four million, seven hundred twenty-five thousand, four hundred fifty-five".