6516066665161 has 4 divisors (see below), whose sum is σ = 6516091062292. Its totient is φ = 6516042268032.

The previous prime is 6516066665131. The next prime is 6516066665191. The reversal of 6516066665161 is 1615666606156.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6516066665131) and next prime (6516066665191).

It can be written as a sum of positive squares in 2 ways, for example, as 4957551621136 + 1558515044025 = 2226556^2 + 1248405^2 .

It is a cyclic number.

It is not a de Polignac number, because 6516066665161 - 2¹⁹ = 6516066140873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6516066665131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11793456 + ... + 12333601.

It is an arithmetic number, because the mean of its divisors is an integer number (1629022765573).

Almost surely, 2^{6516066665161} is an apocalyptic number.

It is an amenable number.

6516066665161 is a deficient number, since it is larger than the sum of its proper divisors (24397131).

6516066665161 is a wasteful number, since it uses less digits than its factorization.

6516066665161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24397130.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 6516066665161 in words is "six trillion, five hundred sixteen billion, sixty-six million, six hundred sixty-five thousand, one hundred sixty-one".