66541367566 has 16 divisors (see below), whose sum is σ = 102140064000. Its totient is φ = 32497517880.

The previous prime is 66541367549. The next prime is 66541367569. The reversal of 66541367566 is 66576314566.

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 7 ways as a sum of consecutive naturals, for example, 662400 + ... + 756211.

It is an arithmetic number, because the mean of its divisors is an integer number (6383754000).

Almost surely, 2^66541367566 is an apocalyptic number.

66541367566 is a deficient number, since it is larger than the sum of its proper divisors (35598696434).

66541367566 is a wasteful number, since it uses less digits than its factorization.

66541367566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419159.

The product of its digits is 16329600, while the sum is 55.

The spelling of 66541367566 in words is "sixty-six billion, five hundred forty-one million, three hundred sixty-seven thousand, five hundred sixty-six".