66501313233520 has 160 divisors (see below), whose sum is σ = 173416393497600. Its totient is φ = 23508932459520.

The previous prime is 66501313233479. The next prime is 66501313233527. The reversal of 66501313233520 is 2533231310566.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501313233527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 767119 + ... + 11558161.

It is an arithmetic number, because the mean of its divisors is an integer number (1083852459360).

Almost surely, 2^{66501313233520} 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 66501313233520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86708196748800).

66501313233520 is an abundant number, since it is smaller than the sum of its proper divisors (106915080264080).

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

66501313233520 is a wasteful number, since it uses less digits than its factorization.

66501313233520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10791263 (or 10791257 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 40.

The spelling of 66501313233520 in words is "sixty-six trillion, five hundred one billion, three hundred thirteen million, two hundred thirty-three thousand, five hundred twenty".