665332444397 has 16 divisors (see below), whose sum is σ = 678111912000. Its totient is φ = 652642636800.

The previous prime is 665332444379. The next prime is 665332444411. The reversal of 665332444397 is 793444233566.

It is a cyclic number.

It is not a de Polignac number, because 665332444397 - 2¹⁶ = 665332378861 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 (665332444327) 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, 15290522 + ... + 15333972.

It is an arithmetic number, because the mean of its divisors is an integer number (42381994500).

Almost surely, 2^665332444397 is an apocalyptic number.

665332444397 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

665332444397 is a deficient number, since it is larger than the sum of its proper divisors (12779467603).

665332444397 is a wasteful number, since it uses less digits than its factorization.

665332444397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44476.

The product of its digits is 39191040, while the sum is 56.

The spelling of 665332444397 in words is "six hundred sixty-five billion, three hundred thirty-two million, four hundred forty-four thousand, three hundred ninety-seven".