6515666660601 has 12 divisors (see below), whose sum is σ = 10756021154112. Its totient is φ = 3723238091736.

The previous prime is 6515666660537. The next prime is 6515666660621. The reversal of 6515666660601 is 1060666665156.

It is not a de Polignac number, because 6515666660601 - 2⁶ = 6515666660537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6515666660621) 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, 51711640101 + ... + 51711640226.

It is an arithmetic number, because the mean of its divisors is an integer number (896335096176).

Almost surely, 2^{6515666660601} is an apocalyptic number.

It is an amenable number.

6515666660601 is a deficient number, since it is larger than the sum of its proper divisors (4240354493511).

6515666660601 is a wasteful number, since it uses less digits than its factorization.

6515666660601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103423280340 (or 103423280337 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 6515666660601 in words is "six trillion, five hundred fifteen billion, six hundred sixty-six million, six hundred sixty thousand, six hundred one".