6660615166501 has 4 divisors (see below), whose sum is σ = 6660631106892. Its totient is φ = 6660599226112.

The previous prime is 6660615166483. The next prime is 6660615166589. The reversal of 6660615166501 is 1056615160666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2974883296225 + 3685731870276 = 1724785^2 + 1919826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660615166501 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 (6660615166201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7326076 + ... + 8184901.

It is an arithmetic number, because the mean of its divisors is an integer number (1665157776723).

Almost surely, 2^{6660615166501} is an apocalyptic number.

It is an amenable number.

6660615166501 is a deficient number, since it is larger than the sum of its proper divisors (15940391).

6660615166501 is a wasteful number, since it uses less digits than its factorization.

6660615166501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15940390.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 6660615166501 in words is "six trillion, six hundred sixty billion, six hundred fifteen million, one hundred sixty-six thousand, five hundred one".