665427657732 has 192 divisors, whose sum is σ = 1679722168320. Its totient is φ = 204283183104.

The previous prime is 665427657709. The next prime is 665427657779. The reversal of 665427657732 is 237756724566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1437208533 + ... + 1437208995.

It is an arithmetic number, because the mean of its divisors is an integer number (8748552960).

Almost surely, 2^665427657732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665427657732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839861084160).

665427657732 is an abundant number, since it is smaller than the sum of its proper divisors (1014294510588).

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

665427657732 is a wasteful number, since it uses less digits than its factorization.

665427657732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1168 counting only the distinct ones).

The product of its digits is 88905600, while the sum is 60.

The spelling of 665427657732 in words is "six hundred sixty-five billion, four hundred twenty-seven million, six hundred fifty-seven thousand, seven hundred thirty-two".