66541367567 has 4 divisors (see below), whose sum is σ = 66546750096. Its totient is φ = 66535985040.

The previous prime is 66541367549. The next prime is 66541367569. The reversal of 66541367567 is 76576314566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76576314566 = 2 ⋅38288157283.

It is a cyclic number.

It is not a de Polignac number, because 66541367567 - 2¹⁰ = 66541366543 is a prime.

It is a super-3 number, since 3×66541367567³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66541367569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2672678 + ... + 2697459.

It is an arithmetic number, because the mean of its divisors is an integer number (16636687524).

Almost surely, 2^66541367567 is an apocalyptic number.

66541367567 is a deficient number, since it is larger than the sum of its proper divisors (5382529).

66541367567 is a wasteful number, since it uses less digits than its factorization.

66541367567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382528.

The product of its digits is 19051200, while the sum is 56.

The spelling of 66541367567 in words is "sixty-six billion, five hundred forty-one million, three hundred sixty-seven thousand, five hundred sixty-seven".