215645032613 has 2 divisors, whose sum is σ = 215645032614. Its totient is φ = 215645032612.

The previous prime is 215645032607. The next prime is 215645032643. The reversal of 215645032613 is 316230546512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214722877924 + 922154689 = 463382^2 + 30367^2 .

It is a cyclic number.

It is not a de Polignac number, because 215645032613 - 2¹⁴ = 215645016229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215645032643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107822516306 + 107822516307.

It is an arithmetic number, because the mean of its divisors is an integer number (107822516307).

Almost surely, 2^215645032613 is an apocalyptic number.

It is an amenable number.

215645032613 is a deficient number, since it is larger than the sum of its proper divisors (1).

215645032613 is an equidigital number, since it uses as much as digits as its factorization.

215645032613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 215645032613 in words is "two hundred fifteen billion, six hundred forty-five million, thirty-two thousand, six hundred thirteen".