66738791546 has 48 divisors (see below), whose sum is σ = 118739636640. Its totient is φ = 28041380640.

The previous prime is 66738791543. The next prime is 66738791579. The reversal of 66738791546 is 64519783766.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66738791543) 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 23 ways as a sum of consecutive naturals, for example, 8155685 + ... + 8163863.

It is an arithmetic number, because the mean of its divisors is an integer number (2473742430).

Almost surely, 2^66738791546 is an apocalyptic number.

66738791546 is a deficient number, since it is larger than the sum of its proper divisors (52000845094).

66738791546 is a wasteful number, since it uses less digits than its factorization.

66738791546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9819 (or 9812 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 62.

The spelling of 66738791546 in words is "sixty-six billion, seven hundred thirty-eight million, seven hundred ninety-one thousand, five hundred forty-six".