66545810723 has 16 divisors (see below), whose sum is σ = 77366016000. Its totient is φ = 56054637312.

The previous prime is 66545810707. The next prime is 66545810743. The reversal of 66545810723 is 32701854566.

It is a cyclic number.

It is not a de Polignac number, because 66545810723 - 2⁴ = 66545810707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66545810743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1363283 + ... + 1411251.

It is an arithmetic number, because the mean of its divisors is an integer number (4835376000).

Almost surely, 2^66545810723 is an apocalyptic number.

66545810723 is a deficient number, since it is larger than the sum of its proper divisors (10820205277).

66545810723 is a wasteful number, since it uses less digits than its factorization.

66545810723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51394.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 66545810723 in words is "sixty-six billion, five hundred forty-five million, eight hundred ten thousand, seven hundred twenty-three".