66715135309 has 12 divisors (see below), whose sum is σ = 72682608000. Its totient is φ = 61164969480.

The previous prime is 66715135307. The next prime is 66715135321. The reversal of 66715135309 is 90353151766.

It is not a de Polignac number, because 66715135309 - 2¹ = 66715135307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66715135307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2969559 + ... + 2991940.

It is an arithmetic number, because the mean of its divisors is an integer number (6056884000).

Almost surely, 2^66715135309 is an apocalyptic number.

It is an amenable number.

66715135309 is a deficient number, since it is larger than the sum of its proper divisors (5967472691).

66715135309 is a wasteful number, since it uses less digits than its factorization.

66715135309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5961568 (or 5961549 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 46.

The spelling of 66715135309 in words is "sixty-six billion, seven hundred fifteen million, one hundred thirty-five thousand, three hundred nine".