215015866651 has 2 divisors, whose sum is σ = 215015866652. Its totient is φ = 215015866650.

The previous prime is 215015866633. The next prime is 215015866673. The reversal of 215015866651 is 156668510512.

215015866651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215015866651 - 2⁹ = 215015866139 is a prime.

It is a super-2 number, since 2×215015866651² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215015866951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107507933325 + 107507933326.

It is an arithmetic number, because the mean of its divisors is an integer number (107507933326).

Almost surely, 2^215015866651 is an apocalyptic number.

215015866651 is a deficient number, since it is larger than the sum of its proper divisors (1).

215015866651 is an equidigital number, since it uses as much as digits as its factorization.

215015866651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 215015866651 in words is "two hundred fifteen billion, fifteen million, eight hundred sixty-six thousand, six hundred fifty-one".