216015628561 has 2 divisors, whose sum is σ = 216015628562. Its totient is φ = 216015628560.

The previous prime is 216015628523. The next prime is 216015628579. The reversal of 216015628561 is 165826510612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192251556225 + 23764072336 = 438465^2 + 154156^2 .

It is a cyclic number.

It is not a de Polignac number, because 216015628561 - 2¹³ = 216015620369 is a prime.

It is not a weakly prime, because it can be changed into another prime (216015628261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108007814280 + 108007814281.

It is an arithmetic number, because the mean of its divisors is an integer number (108007814281).

Almost surely, 2^216015628561 is an apocalyptic number.

It is an amenable number.

216015628561 is a deficient number, since it is larger than the sum of its proper divisors (1).

216015628561 is an equidigital number, since it uses as much as digits as its factorization.

216015628561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 216015628561 in words is "two hundred sixteen billion, fifteen million, six hundred twenty-eight thousand, five hundred sixty-one".