66457813752566 has 16 divisors (see below), whose sum is σ = 100674192366288. Its totient is φ = 32899752732000.

The previous prime is 66457813752433. The next prime is 66457813752569. The reversal of 66457813752566 is 66525731875466.

It is a self number, because there is not a number n which added to its sum of digits gives 66457813752566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457813752569) 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, 50591021 + ... + 51888023.

It is an arithmetic number, because the mean of its divisors is an integer number (6292137022893).

Almost surely, 2^{66457813752566} is an apocalyptic number.

66457813752566 is a deficient number, since it is larger than the sum of its proper divisors (34216378613722).

66457813752566 is a wasteful number, since it uses less digits than its factorization.

66457813752566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550767.

The product of its digits is 1524096000, while the sum is 71.

The spelling of 66457813752566 in words is "sixty-six trillion, four hundred fifty-seven billion, eight hundred thirteen million, seven hundred fifty-two thousand, five hundred sixty-six".