665025413312671 has 8 divisors (see below), whose sum is σ = 679202398358784. Its totient is φ = 650849574440280.

The previous prime is 665025413312651. The next prime is 665025413312713. The reversal of 665025413312671 is 176213314520566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665025413312671 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 (665025413312621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285370585 + ... + 287691538.

It is an arithmetic number, because the mean of its divisors is an integer number (84900299794848).

Almost surely, 2^{665025413312671} is an apocalyptic number.

665025413312671 is a deficient number, since it is larger than the sum of its proper divisors (14176985046113).

665025413312671 is a wasteful number, since it uses less digits than its factorization.

665025413312671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573086861.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 665025413312671 in words is "six hundred sixty-five trillion, twenty-five billion, four hundred thirteen million, three hundred twelve thousand, six hundred seventy-one".