6661215201 has 24 divisors (see below), whose sum is σ = 9145075104. Its totient is φ = 4312584640.

The previous prime is 6661215199. The next prime is 6661215251. The reversal of 6661215201 is 1025121666.

It is not a de Polignac number, because 6661215201 - 2¹ = 6661215199 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6661215251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 864301 + ... + 871973.

It is an arithmetic number, because the mean of its divisors is an integer number (381044796).

Almost surely, 2^6661215201 is an apocalyptic number.

It is an amenable number.

6661215201 is a deficient number, since it is larger than the sum of its proper divisors (2483859903).

6661215201 is a wasteful number, since it uses less digits than its factorization.

6661215201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7901 (or 7854 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 6661215201 is about 81616.2679923555. The cubic root of 6661215201 is about 1881.5589153075.

Adding to 6661215201 its reverse (1025121666), we get a palindrome (7686336867).

The spelling of 6661215201 in words is "six billion, six hundred sixty-one million, two hundred fifteen thousand, two hundred one".