66305637630 has 144 divisors (see below), whose sum is σ = 180950580720. Its totient is φ = 16843825152.

The previous prime is 66305637623. The next prime is 66305637667. The reversal of 66305637630 is 3673650366.

66305637630 is a `hidden beast` number, since 6 + 6 + 3 + 0 + 5 + 6 + 3 + 7 + 630 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12233061 + ... + 12238479.

It is an arithmetic number, because the mean of its divisors is an integer number (1256601255).

Almost surely, 2^66305637630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66305637630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90475290360).

66305637630 is an abundant number, since it is smaller than the sum of its proper divisors (114644943090).

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

66305637630 is a wasteful number, since it uses less digits than its factorization.

66305637630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735 (or 5709 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 45.

The spelling of 66305637630 in words is "sixty-six billion, three hundred five million, six hundred thirty-seven thousand, six hundred thirty".