6661156201 has 8 divisors (see below), whose sum is σ = 7943739264. Its totient is φ = 5461320480.

The previous prime is 6661156181. The next prime is 6661156237. The reversal of 6661156201 is 1026511666.

It is a happy number.

6661156201 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6661156201 - 2⁹ = 6661155689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6661156241) 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, 20686660 + ... + 20686981.

It is an arithmetic number, because the mean of its divisors is an integer number (992967408).

Almost surely, 2^6661156201 is an apocalyptic number.

It is an amenable number.

6661156201 is a deficient number, since it is larger than the sum of its proper divisors (1282583063).

6661156201 is a wasteful number, since it uses less digits than its factorization.

6661156201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41373671.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 6661156201 is about 81615.9065440065. The cubic root of 6661156201 is about 1881.5533601497.

Adding to 6661156201 its reverse (1026511666), we get a palindrome (7687667867).

The spelling of 6661156201 in words is "six billion, six hundred sixty-one million, one hundred fifty-six thousand, two hundred one".