215128277713 has 4 divisors (see below), whose sum is σ = 215131888228. Its totient is φ = 215124667200.

The previous prime is 215128277701. The next prime is 215128277719. The reversal of 215128277713 is 317772821512.

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 154820214784 + 60308062929 = 393472^2 + 245577^2 .

It is a cyclic number.

It is not a de Polignac number, because 215128277713 - 2¹⁷ = 215128146641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215128277719) 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, 1714356 + ... + 1835557.

It is an arithmetic number, because the mean of its divisors is an integer number (53782972057).

Almost surely, 2^215128277713 is an apocalyptic number.

It is an amenable number.

215128277713 is a deficient number, since it is larger than the sum of its proper divisors (3610515).

215128277713 is an equidigital number, since it uses as much as digits as its factorization.

215128277713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610514.

The product of its digits is 329280, while the sum is 46.

The spelling of 215128277713 in words is "two hundred fifteen billion, one hundred twenty-eight million, two hundred seventy-seven thousand, seven hundred thirteen".