6666215601 has 4 divisors (see below), whose sum is σ = 8888287472. Its totient is φ = 4444143732.

The previous prime is 6666215599. The next prime is 6666215641. The reversal of 6666215601 is 1065126666.

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 not a de Polignac number, because 6666215601 - 2¹ = 6666215599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666215601.

It is not an unprimeable number, because it can be changed into a prime (6666215641) 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, 1111035931 + ... + 1111035936.

It is an arithmetic number, because the mean of its divisors is an integer number (2222071868).

Almost surely, 2^6666215601 is an apocalyptic number.

It is an amenable number.

6666215601 is a deficient number, since it is larger than the sum of its proper divisors (2222071871).

6666215601 is a wasteful number, since it uses less digits than its factorization.

6666215601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222071870.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 6666215601 is about 81646.8958442389. The cubic root of 6666215601 is about 1882.0296099003.

The spelling of 6666215601 in words is "six billion, six hundred sixty-six million, two hundred fifteen thousand, six hundred one".