665432747556 has 12 divisors (see below), whose sum is σ = 1552676410992. Its totient is φ = 221810915848.

The previous prime is 665432747537. The next prime is 665432747569. The reversal of 665432747556 is 655747234566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 665432747556.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27726364470 + ... + 27726364493.

It is an arithmetic number, because the mean of its divisors is an integer number (129389700916).

Almost surely, 2^665432747556 is an apocalyptic number.

It is an amenable number.

665432747556 is an abundant number, since it is smaller than the sum of its proper divisors (887243663436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665432747556 is a wasteful number, since it uses less digits than its factorization.

665432747556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55452728970 (or 55452728968 counting only the distinct ones).

The product of its digits is 127008000, while the sum is 60.

The spelling of 665432747556 in words is "six hundred sixty-five billion, four hundred thirty-two million, seven hundred forty-seven thousand, five hundred fifty-six".