6661616516051 has 32 divisors (see below), whose sum is σ = 8012705742720. Its totient is φ = 5418129484800.

The previous prime is 6661616516021. The next prime is 6661616516053. The reversal of 6661616516051 is 1506156161666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661616516051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6661616516053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28992245 + ... + 29221113.

It is an arithmetic number, because the mean of its divisors is an integer number (250397054460).

Almost surely, 2^{6661616516051} is an apocalyptic number.

6661616516051 is a deficient number, since it is larger than the sum of its proper divisors (1351089226669).

6661616516051 is a wasteful number, since it uses less digits than its factorization.

6661616516051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231695.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 6661616516051 in words is "six trillion, six hundred sixty-one billion, six hundred sixteen million, five hundred sixteen thousand, fifty-one".