66541703746 has 48 divisors (see below), whose sum is σ = 122375534400. Its totient is φ = 26982432288.

The previous prime is 66541703741. The next prime is 66541703759. The reversal of 66541703746 is 64730714566.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 66541703746.

It is not an unprimeable number, because it can be changed into a prime (66541703741) 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, 1461595 + ... + 1506433.

It is an arithmetic number, because the mean of its divisors is an integer number (2549490300).

Almost surely, 2^66541703746 is an apocalyptic number.

66541703746 is a deficient number, since it is larger than the sum of its proper divisors (55833830654).

66541703746 is a wasteful number, since it uses less digits than its factorization.

66541703746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45671 (or 45664 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 66541703746 in words is "sixty-six billion, five hundred forty-one million, seven hundred three thousand, seven hundred forty-six".