65666361215 has 16 divisors (see below), whose sum is σ = 96984164928. Its totient is φ = 41564641536.

The previous prime is 65666361179. The next prime is 65666361239. The reversal of 65666361215 is 51216366656.

It is a cyclic number.

It is not a de Polignac number, because 65666361215 - 2⁶ = 65666361151 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 65666361215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72160382 + ... + 72161291.

It is an arithmetic number, because the mean of its divisors is an integer number (6061510308).

Almost surely, 2^65666361215 is an apocalyptic number.

65666361215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

65666361215 is a deficient number, since it is larger than the sum of its proper divisors (31317803713).

65666361215 is a wasteful number, since it uses less digits than its factorization.

65666361215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144321698.

The product of its digits is 1166400, while the sum is 47.

The spelling of 65666361215 in words is "sixty-five billion, six hundred sixty-six million, three hundred sixty-one thousand, two hundred fifteen".