215540423123225 has 12 divisors (see below), whose sum is σ = 269722144168620. Its totient is φ = 170850390436800.

The previous prime is 215540423123177. The next prime is 215540423123227. The reversal of 215540423123225 is 522321324045512.

It can be written as a sum of positive squares in 6 ways, for example, as 19690838254096 + 195849584869129 = 4437436^2 + 13994627^2 .

It is not a de Polignac number, because 215540423123225 - 2³⁰ = 215539349381401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215540423123227) 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 in 11 ways as a sum of consecutive naturals, for example, 39548698766 + ... + 39548704215.

It is an arithmetic number, because the mean of its divisors is an integer number (22476845347385).

Almost surely, 2^{215540423123225} is an apocalyptic number.

215540423123225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215540423123225 is a deficient number, since it is larger than the sum of its proper divisors (54181721045395).

215540423123225 is a wasteful number, since it uses less digits than its factorization.

215540423123225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79097403100 (or 79097403095 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 215540423123225 its reverse (522321324045512), we get a palindrome (737861747168737).

The spelling of 215540423123225 in words is "two hundred fifteen trillion, five hundred forty billion, four hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty-five".