66023687520 has 768 divisors, whose sum is σ = 276950016000. Its totient is φ = 14371209216.

The previous prime is 66023687473. The next prime is 66023687533. The reversal of 66023687520 is 2578632066.

It is a happy number.

66023687520 is a `hidden beast` number, since 6 + 60 + 2 + 3 + 68 + 7 + 520 = 666.

66023687520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 69279364 + ... + 69280316.

It is an arithmetic number, because the mean of its divisors is an integer number (360612000).

Almost surely, 2^66023687520 is an apocalyptic number.

66023687520 is a gapful number since it is divisible by the number (60) 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 66023687520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138475008000).

66023687520 is an abundant number, since it is smaller than the sum of its proper divisors (210926328480).

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

66023687520 is a wasteful number, since it uses less digits than its factorization.

66023687520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 66023687520 in words is "sixty-six billion, twenty-three million, six hundred eighty-seven thousand, five hundred twenty".