66617704832896 has 128 divisors (see below), whose sum is σ = 159898171023360. Its totient is φ = 27041601392640.

The previous prime is 66617704832863. The next prime is 66617704832941. The reversal of 66617704832896 is 69823840771666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24209325 + ... + 26820268.

It is an arithmetic number, because the mean of its divisors is an integer number (1249204461120).

Almost surely, 2^{66617704832896} is an apocalyptic number.

It is an amenable number.

66617704832896 is an abundant number, since it is smaller than the sum of its proper divisors (93280466190464).

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

66617704832896 is a wasteful number, since it uses less digits than its factorization.

66617704832896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51029692 (or 51029680 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 73.

The spelling of 66617704832896 in words is "sixty-six trillion, six hundred seventeen billion, seven hundred four million, eight hundred thirty-two thousand, eight hundred ninety-six".