6616666501 has 4 divisors (see below), whose sum is σ = 6640047232. Its totient is φ = 6593285772.

The previous prime is 6616666493. The next prime is 6616666549. The reversal of 6616666501 is 1056666166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6616666501 - 2³ = 6616666493 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 (6616661501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11689941 + ... + 11690506.

It is an arithmetic number, because the mean of its divisors is an integer number (1660011808).

Almost surely, 2^6616666501 is an apocalyptic number.

It is an amenable number.

6616666501 is a deficient number, since it is larger than the sum of its proper divisors (23380731).

6616666501 is a wasteful number, since it uses less digits than its factorization.

6616666501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23380730.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 6616666501 is about 81342.8945944266. The cubic root of 6616666501 is about 1877.3550497403.

The spelling of 6616666501 in words is "six billion, six hundred sixteen million, six hundred sixty-six thousand, five hundred one".