215543651123 has 2 divisors, whose sum is σ = 215543651124. Its totient is φ = 215543651122.

The previous prime is 215543651087. The next prime is 215543651137. The reversal of 215543651123 is 321156345512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215543651123 - 2¹⁰ = 215543650099 is a prime.

It is a super-2 number, since 2×215543651123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215543651923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107771825561 + 107771825562.

It is an arithmetic number, because the mean of its divisors is an integer number (107771825562).

Almost surely, 2^215543651123 is an apocalyptic number.

215543651123 is a deficient number, since it is larger than the sum of its proper divisors (1).

215543651123 is an equidigital number, since it uses as much as digits as its factorization.

215543651123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

Adding to 215543651123 its reverse (321156345512), we get a palindrome (536699996635).

The spelling of 215543651123 in words is "two hundred fifteen billion, five hundred forty-three million, six hundred fifty-one thousand, one hundred twenty-three".