665636377560 has 256 divisors, whose sum is σ = 2490565708800. Its totient is φ = 138263347200.

The previous prime is 665636377547. The next prime is 665636377577. The reversal of 665636377560 is 65773636566.

665636377560 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 665636377494 and 665636377503.

It is a congruent 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, 28530700 + ... + 28554020.

It is an arithmetic number, because the mean of its divisors is an integer number (9728772300).

Almost surely, 2^665636377560 is an apocalyptic number.

665636377560 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 665636377560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245282854400).

665636377560 is an abundant number, since it is smaller than the sum of its proper divisors (1824929331240).

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

665636377560 is a wasteful number, since it uses less digits than its factorization.

665636377560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26442 (or 26438 counting only the distinct ones).

The product of its (nonzero) digits is 85730400, while the sum is 60.

The spelling of 665636377560 in words is "six hundred sixty-five billion, six hundred thirty-six million, three hundred seventy-seven thousand, five hundred sixty".