215406304513 has 4 divisors (see below), whose sum is σ = 228077263620. Its totient is φ = 202735345408.

The previous prime is 215406304511. The next prime is 215406304517. The reversal of 215406304513 is 315403604512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 171555012864 + 43851291649 = 414192^2 + 209407^2 .

It is a cyclic number.

It is not a de Polignac number, because 215406304513 - 2¹ = 215406304511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215406304511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6335479528 + ... + 6335479561.

It is an arithmetic number, because the mean of its divisors is an integer number (57019315905).

Almost surely, 2^215406304513 is an apocalyptic number.

It is an amenable number.

215406304513 is a deficient number, since it is larger than the sum of its proper divisors (12670959107).

215406304513 is a wasteful number, since it uses less digits than its factorization.

215406304513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12670959106.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 215406304513 in words is "two hundred fifteen billion, four hundred six million, three hundred four thousand, five hundred thirteen".