66517215106 has 8 divisors (see below), whose sum is σ = 100327070844. Its totient is φ = 33074858160.

The previous prime is 66517215091. The next prime is 66517215109. The reversal of 66517215106 is 60151271566.

It can be written as a sum of positive squares in 2 ways, for example, as 64178622225 + 2338592881 = 253335^2 + 48359^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66517215109) 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, 91874245 + ... + 91874968.

Almost surely, 2^66517215106 is an apocalyptic number.

66517215106 is a deficient number, since it is larger than the sum of its proper divisors (33809855738).

66517215106 is a wasteful number, since it uses less digits than its factorization.

66517215106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183749396.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 66517215106 in words is "sixty-six billion, five hundred seventeen million, two hundred fifteen thousand, one hundred six".