665434627761 has 8 divisors (see below), whose sum is σ = 896030786304. Its totient is φ = 439230777200.

The previous prime is 665434627723. The next prime is 665434627787. The reversal of 665434627761 is 167726434566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 665434627761 - 2¹⁰ = 665434626737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665434627721) 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, 1098076641 + ... + 1098077246.

It is an arithmetic number, because the mean of its divisors is an integer number (112003848288).

Almost surely, 2^665434627761 is an apocalyptic number.

It is an amenable number.

665434627761 is a deficient number, since it is larger than the sum of its proper divisors (230596158543).

665434627761 is a wasteful number, since it uses less digits than its factorization.

665434627761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196153991.

The product of its digits is 30481920, while the sum is 57.

The spelling of 665434627761 in words is "six hundred sixty-five billion, four hundred thirty-four million, six hundred twenty-seven thousand, seven hundred sixty-one".