65666150516655 has 48 divisors (see below), whose sum is σ = 127116696339360. Its totient is φ = 32327951015808.

The previous prime is 65666150516611. The next prime is 65666150516663. The reversal of 65666150516655 is 55661505166656.

It is not a de Polignac number, because 65666150516655 - 2⁸ = 65666150516399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65666150516592 and 65666150516601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2078684760 + ... + 2078716349.

It is an arithmetic number, because the mean of its divisors is an integer number (2648264507070).

Almost surely, 2^{65666150516655} is an apocalyptic number.

65666150516655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

65666150516655 is a deficient number, since it is larger than the sum of its proper divisors (61450545822705).

65666150516655 is a wasteful number, since it uses less digits than its factorization.

65666150516655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157401142 (or 4157401130 counting only the distinct ones).

The product of its (nonzero) digits is 145800000, while the sum is 63.

The spelling of 65666150516655 in words is "sixty-five trillion, six hundred sixty-six billion, one hundred fifty million, five hundred sixteen thousand, six hundred fifty-five".