66242755658 has 4 divisors (see below), whose sum is σ = 99364133490. Its totient is φ = 33121377828.

The previous prime is 66242755633. The next prime is 66242755687. The reversal of 66242755658 is 85655724266.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 66134865889 + 107889769 = 257167^2 + 10387^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16560688913 + ... + 16560688916.

Almost surely, 2^66242755658 is an apocalyptic number.

66242755658 is a deficient number, since it is larger than the sum of its proper divisors (33121377832).

66242755658 is a wasteful number, since it uses less digits than its factorization.

66242755658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33121377831.

The product of its digits is 24192000, while the sum is 56.

The spelling of 66242755658 in words is "sixty-six billion, two hundred forty-two million, seven hundred fifty-five thousand, six hundred fifty-eight".