665567760 has 480 divisors, whose sum is σ = 2560086144. Its totient is φ = 141926400.

The previous prime is 665567759. The next prime is 665567761. The reversal of 665567760 is 67765566.

It is an interprime number because it is at equal distance from previous prime (665567759) and next prime (665567761).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665567761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15478299 + ... + 15478341.

Almost surely, 2^665567760 is an apocalyptic number.

665567760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665567760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280043072).

665567760 is an abundant number, since it is smaller than the sum of its proper divisors (1894518384).

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

665567760 is a wasteful number, since it uses less digits than its factorization.

665567760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 48.

The square root of 665567760 is about 25798.5999620134. The cubic root of 665567760 is about 873.1002090632.

The spelling of 665567760 in words is "six hundred sixty-five million, five hundred sixty-seven thousand, seven hundred sixty".