664573590637 has 4 divisors (see below), whose sum is σ = 724989371616. Its totient is φ = 604157809660.

The previous prime is 664573590631. The next prime is 664573590743. The reversal of 664573590637 is 736095375466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664573590637 - 2³⁵ = 630213852269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664573590631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30207890473 + ... + 30207890494.

It is an arithmetic number, because the mean of its divisors is an integer number (181247342904).

Almost surely, 2^664573590637 is an apocalyptic number.

It is an amenable number.

664573590637 is a deficient number, since it is larger than the sum of its proper divisors (60415780979).

664573590637 is a wasteful number, since it uses less digits than its factorization.

664573590637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60415780978.

The product of its (nonzero) digits is 85730400, while the sum is 61.

The spelling of 664573590637 in words is "six hundred sixty-four billion, five hundred seventy-three million, five hundred ninety thousand, six hundred thirty-seven".