215115346225 has 12 divisors (see below), whose sum is σ = 287261724316. Its totient is φ = 158854409280.

The previous prime is 215115346223. The next prime is 215115346261. The reversal of 215115346225 is 522643511512.

It can be written as a sum of positive squares in 6 ways, for example, as 56347365376 + 158767980849 = 237376^2 + 398457^2 .

It is not a de Polignac number, because 215115346225 - 2¹ = 215115346223 is a prime.

It is a super-2 number, since 2×215115346225² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215115346223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330946362 + ... + 330947011.

Almost surely, 2^215115346225 is an apocalyptic number.

215115346225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215115346225 is a deficient number, since it is larger than the sum of its proper divisors (72146378091).

215115346225 is a wasteful number, since it uses less digits than its factorization.

215115346225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661893396 (or 661893391 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

Adding to 215115346225 its reverse (522643511512), we get a palindrome (737758857737).

The spelling of 215115346225 in words is "two hundred fifteen billion, one hundred fifteen million, three hundred forty-six thousand, two hundred twenty-five".