665012331324 has 144 divisors (see below), whose sum is σ = 1886462768736. Its totient is φ = 195751987200.

The previous prime is 665012331311. The next prime is 665012331349. The reversal of 665012331324 is 423133210566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9003504 + ... + 9077064.

It is an arithmetic number, because the mean of its divisors is an integer number (13100435894).

Almost surely, 2^665012331324 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 665012331324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943231384368).

665012331324 is an abundant number, since it is smaller than the sum of its proper divisors (1221450437412).

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

665012331324 is a wasteful number, since it uses less digits than its factorization.

665012331324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74236 (or 74231 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 665012331324 in words is "six hundred sixty-five billion, twelve million, three hundred thirty-one thousand, three hundred twenty-four".