665271365520764 has 12 divisors (see below), whose sum is σ = 1164226268921688. Its totient is φ = 332635288686000.

The previous prime is 665271365520763. The next prime is 665271365520779. The reversal of 665271365520764 is 467025563172566.

It is a self number, because there is not a number n which added to its sum of digits gives 665271365520764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665271365520763) 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, 94703762 + ... + 101485689.

It is an arithmetic number, because the mean of its divisors is an integer number (97018855743474).

Almost surely, 2^{665271365520764} is an apocalyptic number.

It is an amenable number.

665271365520764 is a deficient number, since it is larger than the sum of its proper divisors (498954903400924).

665271365520764 is a wasteful number, since it uses less digits than its factorization.

665271365520764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197037196 (or 197037194 counting only the distinct ones).

The product of its (nonzero) digits is 381024000, while the sum is 65.

The spelling of 665271365520764 in words is "six hundred sixty-five trillion, two hundred seventy-one billion, three hundred sixty-five million, five hundred twenty thousand, seven hundred sixty-four".