66813265530 has 576 divisors, whose sum is σ = 215980836480. Its totient is φ = 14752627200.

The previous prime is 66813265523. The next prime is 66813265553. The reversal of 66813265530 is 3556231866.

66813265530 is a `hidden beast` number, since 6 + 6 + 81 + 32 + 6 + 5 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 2155266615 + ... + 2155266645.

It is an arithmetic number, because the mean of its divisors is an integer number (374966730).

Almost surely, 2^66813265530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66813265530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107990418240).

66813265530 is an abundant number, since it is smaller than the sum of its proper divisors (149167570950).

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

66813265530 is a wasteful number, since it uses less digits than its factorization.

66813265530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 69 counting only the distinct ones).

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

The spelling of 66813265530 in words is "sixty-six billion, eight hundred thirteen million, two hundred sixty-five thousand, five hundred thirty".