66033795640 has 256 divisors, whose sum is σ = 167196441600. Its totient is φ = 23357030400.

The previous prime is 66033795637. The next prime is 66033795683. The reversal of 66033795640 is 4659733066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114443032 + ... + 114443608.

It is an arithmetic number, because the mean of its divisors is an integer number (653111100).

Almost surely, 2^66033795640 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 66033795640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83598220800).

66033795640 is an abundant number, since it is smaller than the sum of its proper divisors (101162645960).

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

66033795640 is a wasteful number, since it uses less digits than its factorization.

66033795640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 49.

The spelling of 66033795640 in words is "sixty-six billion, thirty-three million, seven hundred ninety-five thousand, six hundred forty".