6660565251 has 8 divisors (see below), whose sum is σ = 9097357584. Its totient is φ = 4332074880.

The previous prime is 6660565217. The next prime is 6660565253. The reversal of 6660565251 is 1525650666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6660565251 - 2³⁰ = 5586823427 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6660565253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27075346 + ... + 27075591.

It is an arithmetic number, because the mean of its divisors is an integer number (1137169698).

Almost surely, 2^6660565251 is an apocalyptic number.

6660565251 is a deficient number, since it is larger than the sum of its proper divisors (2436792333).

6660565251 is a wasteful number, since it uses less digits than its factorization.

6660565251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54150981.

The product of its (nonzero) digits is 324000, while the sum is 42.

The square root of 6660565251 is about 81612.2861522700. The cubic root of 6660565251 is about 1881.4977173150.

The spelling of 6660565251 in words is "six billion, six hundred sixty million, five hundred sixty-five thousand, two hundred fifty-one".