66499116631360 has 448 divisors, whose sum is σ = 188803827892224. Its totient is φ = 21829118976000.

The previous prime is 66499116631313. The next prime is 66499116631361. The reversal of 66499116631360 is 6313661199466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66499116631361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12084154369 + ... + 12084159871.

Almost surely, 2^{66499116631360} 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 66499116631360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94401913946112).

66499116631360 is an abundant number, since it is smaller than the sum of its proper divisors (122304711260864).

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

66499116631360 is a wasteful number, since it uses less digits than its factorization.

66499116631360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7382 (or 7372 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 61.

The spelling of 66499116631360 in words is "sixty-six trillion, four hundred ninety-nine billion, one hundred sixteen million, six hundred thirty-one thousand, three hundred sixty".