215858857009 has 2 divisors, whose sum is σ = 215858857010. Its totient is φ = 215858857008.

The previous prime is 215858857003. The next prime is 215858857057. The reversal of 215858857009 is 900758858512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159085311025 + 56773545984 = 398855^2 + 238272^2 .

It is a cyclic number.

It is not a de Polignac number, because 215858857009 - 2⁷ = 215858856881 is a prime.

It is a super-2 number, since 2×215858857009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215858857003) 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 as a sum of consecutive naturals, namely, 107929428504 + 107929428505.

It is an arithmetic number, because the mean of its divisors is an integer number (107929428505).

Almost surely, 2^215858857009 is an apocalyptic number.

It is an amenable number.

215858857009 is a deficient number, since it is larger than the sum of its proper divisors (1).

215858857009 is an equidigital number, since it uses as much as digits as its factorization.

215858857009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064000, while the sum is 58.

The spelling of 215858857009 in words is "two hundred fifteen billion, eight hundred fifty-eight million, eight hundred fifty-seven thousand, nine".