66668215534 has 8 divisors (see below), whose sum is σ = 100102629528. Its totient is φ = 33300672360.

The previous prime is 66668215513. The next prime is 66668215547. The reversal of 66668215534 is 43551286666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16715212 + ... + 16719199.

It is an arithmetic number, because the mean of its divisors is an integer number (12512828691).

Almost surely, 2^66668215534 is an apocalyptic number.

66668215534 is a deficient number, since it is larger than the sum of its proper divisors (33434413994).

66668215534 is a wasteful number, since it uses less digits than its factorization.

66668215534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33435410.

The product of its digits is 6220800, while the sum is 52.

The spelling of 66668215534 in words is "sixty-six billion, six hundred sixty-eight million, two hundred fifteen thousand, five hundred thirty-four".