664610688215 has 16 divisors (see below), whose sum is σ = 798937622208. Its totient is φ = 530752459776.

The previous prime is 664610688211. The next prime is 664610688241. The reversal of 664610688215 is 512886016466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664610688215 - 2² = 664610688211 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 (664610688211) 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 15 ways as a sum of consecutive naturals, for example, 13155494 + ... + 13205916.

It is an arithmetic number, because the mean of its divisors is an integer number (49933601388).

Almost surely, 2^664610688215 is an apocalyptic number.

664610688215 is a deficient number, since it is larger than the sum of its proper divisors (134326933993).

664610688215 is a wasteful number, since it uses less digits than its factorization.

664610688215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55018.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 664610688215 in words is "six hundred sixty-four billion, six hundred ten million, six hundred eighty-eight thousand, two hundred fifteen".