665760236960 has 768 divisors, whose sum is σ = 2116237777920. Its totient is φ = 192618823680.

The previous prime is 665760236941. The next prime is 665760236983. The reversal of 665760236960 is 69632067566.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a junction number, because it is equal to n+sod(n) for n = 665760236896 and 665760236905.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2932864367 + ... + 2932864593.

It is an arithmetic number, because the mean of its divisors is an integer number (2755517940).

Almost surely, 2^665760236960 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 665760236960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058118888960).

665760236960 is an abundant number, since it is smaller than the sum of its proper divisors (1450477540960).

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

665760236960 is a wasteful number, since it uses less digits than its factorization.

665760236960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 665760236960 in words is "six hundred sixty-five billion, seven hundred sixty million, two hundred thirty-six thousand, nine hundred sixty".