66406654263 has 4 divisors (see below), whose sum is σ = 88542205688. Its totient is φ = 44271102840.

The previous prime is 66406654147. The next prime is 66406654283. The reversal of 66406654263 is 36245660466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66406654263 - 2¹³ = 66406646071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66406654283) 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 3 ways as a sum of consecutive naturals, for example, 11067775708 + ... + 11067775713.

It is an arithmetic number, because the mean of its divisors is an integer number (22135551422).

Almost surely, 2^66406654263 is an apocalyptic number.

66406654263 is a deficient number, since it is larger than the sum of its proper divisors (22135551425).

66406654263 is a wasteful number, since it uses less digits than its factorization.

66406654263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22135551424.

The product of its (nonzero) digits is 3732480, while the sum is 48.

The spelling of 66406654263 in words is "sixty-six billion, four hundred six million, six hundred fifty-four thousand, two hundred sixty-three".