665432747605 has 16 divisors (see below), whose sum is σ = 807553704960. Its totient is φ = 526324182912.

The previous prime is 665432747599. The next prime is 665432747627. The reversal of 665432747605 is 506747234566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665432747605 - 2⁹ = 665432747093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6574492 + ... + 6674938.

It is an arithmetic number, because the mean of its divisors is an integer number (50472106560).

Almost surely, 2^665432747605 is an apocalyptic number.

It is an amenable number.

665432747605 is a deficient number, since it is larger than the sum of its proper divisors (142120957355).

665432747605 is a wasteful number, since it uses less digits than its factorization.

665432747605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115428.

The product of its (nonzero) digits is 25401600, while the sum is 55.

The spelling of 665432747605 in words is "six hundred sixty-five billion, four hundred thirty-two million, seven hundred forty-seven thousand, six hundred five".