665382782780 has 24 divisors (see below), whose sum is σ = 1398027541680. Its totient is φ = 266015265920.

The previous prime is 665382782741. The next prime is 665382782803. The reversal of 665382782780 is 87287283566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8575865 + ... + 8653104.

It is an arithmetic number, because the mean of its divisors is an integer number (58251147570).

Almost surely, 2^665382782780 is an apocalyptic number.

It is an amenable number.

665382782780 is an abundant number, since it is smaller than the sum of its proper divisors (732644758900).

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

665382782780 is a wasteful number, since it uses less digits than its factorization.

665382782780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17230909 (or 17230907 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 62.

The spelling of 665382782780 in words is "six hundred sixty-five billion, three hundred eighty-two million, seven hundred eighty-two thousand, seven hundred eighty".