66001614721536 has 480 divisors, whose sum is σ = 200249913042432. Its totient is φ = 19282148720640.

The previous prime is 66001614721513. The next prime is 66001614721543. The reversal of 66001614721536 is 63512741610066.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 426419136 + ... + 426573888.

Almost surely, 2^{66001614721536} 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 66001614721536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100124956521216).

66001614721536 is an abundant number, since it is smaller than the sum of its proper divisors (134248298320896).

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

66001614721536 is a wasteful number, since it uses less digits than its factorization.

66001614721536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154884 (or 154855 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 66001614721536 in words is "sixty-six trillion, one billion, six hundred fourteen million, seven hundred twenty-one thousand, five hundred thirty-six".