664454537 has 4 divisors (see below), whose sum is σ = 703540116. Its totient is φ = 625368960.

The previous prime is 664454489. The next prime is 664454561. The reversal of 664454537 is 735454466.

664454537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735454466 = 2 ⋅367727233.

It can be written as a sum of positive squares in 2 ways, for example, as 587383696 + 77070841 = 24236^2 + 8779^2 .

It is a cyclic number.

It is not a de Polignac number, because 664454537 - 2¹⁰ = 664453513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664454137) 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, 19542764 + ... + 19542797.

It is an arithmetic number, because the mean of its divisors is an integer number (175885029).

Almost surely, 2^664454537 is an apocalyptic number.

It is an amenable number.

664454537 is a deficient number, since it is larger than the sum of its proper divisors (39085579).

664454537 is a wasteful number, since it uses less digits than its factorization.

664454537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39085578.

The product of its digits is 1209600, while the sum is 44.

The square root of 664454537 is about 25777.0156728819. The cubic root of 664454537 is about 872.6131574103.

The spelling of 664454537 in words is "six hundred sixty-four million, four hundred fifty-four thousand, five hundred thirty-seven".