66499439132160 has 1280 divisors, whose sum is σ = 254661200640000. Its totient is φ = 16396635340800.

The previous prime is 66499439132153. The next prime is 66499439132171. The reversal of 66499439132160 is 6123193499466.

66499439132160 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 9 + 439 + 1 + 32 + 160 = 666.

It is a tau number, because it is divible by the number of its divisors (1280).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13851161760 + ... + 13851166560.

It is an arithmetic number, because the mean of its divisors is an integer number (198954063000).

Almost surely, 2^{66499439132160} is an apocalyptic number.

66499439132160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66499439132160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127330600320000).

66499439132160 is an abundant number, since it is smaller than the sum of its proper divisors (188161761507840).

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

66499439132160 is a wasteful number, since it uses less digits than its factorization.

66499439132160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104 (or 5082 counting only the distinct ones).

The product of its (nonzero) digits is 45349632, while the sum is 63.

The spelling of 66499439132160 in words is "sixty-six trillion, four hundred ninety-nine billion, four hundred thirty-nine million, one hundred thirty-two thousand, one hundred sixty".