215172220975913 has 2 divisors, whose sum is σ = 215172220975914. Its totient is φ = 215172220975912.

The previous prime is 215172220975867. The next prime is 215172220975927. The reversal of 215172220975913 is 319579022271512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193467319018009 + 21704901957904 = 13909253^2 + 4658852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215172220975913 is a prime.

It is a super-2 number, since 2×215172220975913² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215172220375913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107586110487956 + 107586110487957.

It is an arithmetic number, because the mean of its divisors is an integer number (107586110487957).

Almost surely, 2^{215172220975913} is an apocalyptic number.

It is an amenable number.

215172220975913 is a deficient number, since it is larger than the sum of its proper divisors (1).

215172220975913 is an equidigital number, since it uses as much as digits as its factorization.

215172220975913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 215172220975913 in words is "two hundred fifteen trillion, one hundred seventy-two billion, two hundred twenty million, nine hundred seventy-five thousand, nine hundred thirteen".