665210530944 has 1024 divisors, whose sum is σ = 2312478720000. Its totient is φ = 186803159040.

The previous prime is 665210530939. The next prime is 665210530951. The reversal of 665210530944 is 449035012566.

665210530944 is a `hidden beast` number, since 6 + 6 + 5 + 21 + 0 + 530 + 94 + 4 = 666.

It is a super-2 number, since 2×665210530944² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665210530944.

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, 1626431412 + ... + 1626431820.

It is an arithmetic number, because the mean of its divisors is an integer number (2258280000).

Almost surely, 2^665210530944 is an apocalyptic number.

665210530944 is a gapful number since it is divisible by the number (64) 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 665210530944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1156239360000).

665210530944 is an abundant number, since it is smaller than the sum of its proper divisors (1647268189056).

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

665210530944 is a wasteful number, since it uses less digits than its factorization.

665210530944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 665210530944 in words is "six hundred sixty-five billion, two hundred ten million, five hundred thirty thousand, nine hundred forty-four".