66404505223 has 16 divisors (see below), whose sum is σ = 79218694656. Its totient is φ = 54424038240.

The previous prime is 66404505179. The next prime is 66404505247. The reversal of 66404505223 is 32250540466.

66404505223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66404505223 - 2²⁹ = 65867634311 is a prime.

It is a super-2 number, since 2×66404505223² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404505253) 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, 388540 + ... + 532702.

It is an arithmetic number, because the mean of its divisors is an integer number (4951168416).

Almost surely, 2^66404505223 is an apocalyptic number.

66404505223 is a deficient number, since it is larger than the sum of its proper divisors (12814189433).

66404505223 is a wasteful number, since it uses less digits than its factorization.

66404505223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147054.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 66404505223 in words is "sixty-six billion, four hundred four million, five hundred five thousand, two hundred twenty-three".