66517215104 has 16 divisors (see below), whose sum is σ = 132514764720. Its totient is φ = 33258607488.

The previous prime is 66517215091. The next prime is 66517215109. The reversal of 66517215104 is 40151271566.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66517215109) 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 as a sum of consecutive naturals, namely, 259832744 + ... + 259832999.

It is an arithmetic number, because the mean of its divisors is an integer number (8282172795).

Almost surely, 2^66517215104 is an apocalyptic number.

66517215104 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66517215104 is a deficient number, since it is larger than the sum of its proper divisors (65997549616).

66517215104 is an equidigital number, since it uses as much as digits as its factorization.

66517215104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519665757 (or 519665745 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 66517215104 in words is "sixty-six billion, five hundred seventeen million, two hundred fifteen thousand, one hundred four".