665560017127 has 16 divisors (see below), whose sum is σ = 719811449280. Its totient is φ = 613733801472.

The previous prime is 665560017091. The next prime is 665560017149. The reversal of 665560017127 is 721710065566.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665560017127 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 (665560017527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3494818 + ... + 3680335.

It is an arithmetic number, because the mean of its divisors is an integer number (44988215580).

Almost surely, 2^665560017127 is an apocalyptic number.

665560017127 is a deficient number, since it is larger than the sum of its proper divisors (54251432153).

665560017127 is a wasteful number, since it uses less digits than its factorization.

665560017127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175322.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 665560017127 in words is "six hundred sixty-five billion, five hundred sixty million, seventeen thousand, one hundred twenty-seven".