66042212615 has 4 divisors (see below), whose sum is σ = 79250655144. Its totient is φ = 52833770088.

The previous prime is 66042212591. The next prime is 66042212669. The reversal of 66042212615 is 51621224066.

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

It is a cyclic number.

It is not a de Polignac number, because 66042212615 - 2¹⁰ = 66042211591 is a prime.

It is a Duffinian number.

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, 6604221257 + ... + 6604221266.

It is an arithmetic number, because the mean of its divisors is an integer number (19812663786).

Almost surely, 2^66042212615 is an apocalyptic number.

66042212615 is a deficient number, since it is larger than the sum of its proper divisors (13208442529).

66042212615 is a wasteful number, since it uses less digits than its factorization.

66042212615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13208442528.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 66042212615 in words is "sixty-six billion, forty-two million, two hundred twelve thousand, six hundred fifteen".