665909108927 has 2 divisors, whose sum is σ = 665909108928. Its totient is φ = 665909108926.

The previous prime is 665909108899. The next prime is 665909108993. The reversal of 665909108927 is 729801909566.

665909108927 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665909108927 - 2²⁴ = 665892331711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665909108927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665909108027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332954554463 + 332954554464.

It is an arithmetic number, because the mean of its divisors is an integer number (332954554464).

Almost surely, 2^665909108927 is an apocalyptic number.

665909108927 is a deficient number, since it is larger than the sum of its proper divisors (1).

665909108927 is an equidigital number, since it uses as much as digits as its factorization.

665909108927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 665909108927 in words is "six hundred sixty-five billion, nine hundred nine million, one hundred eight thousand, nine hundred twenty-seven".