665470028124 has 144 divisors (see below), whose sum is σ = 1943521122816. Its totient is φ = 189747417600.

The previous prime is 665470028123. The next prime is 665470028191. The reversal of 665470028124 is 421820074566.

665470028124 is a `hidden beast` number, since 6 + 6 + 547 + 0 + 0 + 2 + 81 + 24 = 666.

665470028124 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 665470028124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665470028123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33185469 + ... + 33205515.

It is an arithmetic number, because the mean of its divisors is an integer number (13496674464).

Almost surely, 2^665470028124 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 665470028124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971760561408).

665470028124 is an abundant number, since it is smaller than the sum of its proper divisors (1278051094692).

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

665470028124 is a wasteful number, since it uses less digits than its factorization.

665470028124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25016 (or 25011 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 665470028124 in words is "six hundred sixty-five billion, four hundred seventy million, twenty-eight thousand, one hundred twenty-four".