215472656449 has 2 divisors, whose sum is σ = 215472656450. Its totient is φ = 215472656448.

The previous prime is 215472656447. The next prime is 215472656471. The reversal of 215472656449 is 944656274512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114216961600 + 101255694849 = 337960^2 + 318207^2 .

It is a cyclic number.

It is not a de Polignac number, because 215472656449 - 2¹ = 215472656447 is a prime.

Together with 215472656447, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 215472656449.

It is not a weakly prime, because it can be changed into another prime (215472656447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107736328224 + 107736328225.

It is an arithmetic number, because the mean of its divisors is an integer number (107736328225).

Almost surely, 2^215472656449 is an apocalyptic number.

It is an amenable number.

215472656449 is a deficient number, since it is larger than the sum of its proper divisors (1).

215472656449 is an equidigital number, since it uses as much as digits as its factorization.

215472656449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 55.

The spelling of 215472656449 in words is "two hundred fifteen billion, four hundred seventy-two million, six hundred fifty-six thousand, four hundred forty-nine".