66666524542 has 8 divisors (see below), whose sum is σ = 100107432000. Its totient is φ = 33297380544.

The previous prime is 66666524467. The next prime is 66666524543. The reversal of 66666524542 is 24542566666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66666524542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666524543) 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, 17938542 + ... + 17942257.

It is an arithmetic number, because the mean of its divisors is an integer number (12513429000).

Almost surely, 2^66666524542 is an apocalyptic number.

66666524542 is a deficient number, since it is larger than the sum of its proper divisors (33440907458).

66666524542 is a wasteful number, since it uses less digits than its factorization.

66666524542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35881730.

The product of its digits is 12441600, while the sum is 52.

The spelling of 66666524542 in words is "sixty-six billion, six hundred sixty-six million, five hundred twenty-four thousand, five hundred forty-two".