66149559820799 has 48 divisors (see below), whose sum is σ = 84621519013248. Its totient is φ = 51240641715648.

The previous prime is 66149559820783. The next prime is 66149559820807. The reversal of 66149559820799 is 99702895594166.

It is not a de Polignac number, because 66149559820799 - 2⁴ = 66149559820783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66149559820199) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2202284 + ... + 11711070.

It is an arithmetic number, because the mean of its divisors is an integer number (1762948312776).

Almost surely, 2^{66149559820799} is an apocalyptic number.

66149559820799 is a deficient number, since it is larger than the sum of its proper divisors (18471959192449).

66149559820799 is a wasteful number, since it uses less digits than its factorization.

66149559820799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509044 (or 9509037 counting only the distinct ones).

The product of its (nonzero) digits is 2645395200, while the sum is 80.

The spelling of 66149559820799 in words is "sixty-six trillion, one hundred forty-nine billion, five hundred fifty-nine million, eight hundred twenty thousand, seven hundred ninety-nine".