664550575556207 has 4 divisors (see below), whose sum is σ = 666258931791960. Its totient is φ = 662842219320456.

The previous prime is 664550575556129. The next prime is 664550575556279. The reversal of 664550575556207 is 702655575055466.

It is a happy number.

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 664550575556207 - 2¹⁰ = 664550575555183 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 (664550575516207) 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, 854178117293 + ... + 854178118070.

It is an arithmetic number, because the mean of its divisors is an integer number (166564732947990).

Almost surely, 2^{664550575556207} is an apocalyptic number.

664550575556207 is a deficient number, since it is larger than the sum of its proper divisors (1708356235753).

664550575556207 is a wasteful number, since it uses less digits than its factorization.

664550575556207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708356235752.

The product of its (nonzero) digits is 1323000000, while the sum is 68.

The spelling of 664550575556207 in words is "six hundred sixty-four trillion, five hundred fifty billion, five hundred seventy-five million, five hundred fifty-six thousand, two hundred seven".