66517215105 has 32 divisors (see below), whose sum is σ = 116283525120. Its totient is φ = 32200562880.

The previous prime is 66517215091. The next prime is 66517215109. The reversal of 66517215105 is 50151271566.

It is a happy number.

It is not a de Polignac number, because 66517215105 - 2¹⁰ = 66517214081 is a prime.

It is a super-2 number, since 2×66517215105² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 207385 + ... + 419574.

It is an arithmetic number, because the mean of its divisors is an integer number (3633860160).

Almost surely, 2^66517215105 is an apocalyptic number.

It is an amenable number.

66517215105 is a deficient number, since it is larger than the sum of its proper divisors (49766310015).

66517215105 is a wasteful number, since it uses less digits than its factorization.

66517215105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627621.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 66517215105 in words is "sixty-six billion, five hundred seventeen million, two hundred fifteen thousand, one hundred five".