216525395291 has 2 divisors, whose sum is σ = 216525395292. Its totient is φ = 216525395290.

The previous prime is 216525395267. The next prime is 216525395311. The reversal of 216525395291 is 192593525612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216525395291 is a prime.

It is not a weakly prime, because it can be changed into another prime (216525395791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108262697645 + 108262697646.

It is an arithmetic number, because the mean of its divisors is an integer number (108262697646).

Almost surely, 2^216525395291 is an apocalyptic number.

216525395291 is a deficient number, since it is larger than the sum of its proper divisors (1).

216525395291 is an equidigital number, since it uses as much as digits as its factorization.

216525395291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458000, while the sum is 50.

The spelling of 216525395291 in words is "two hundred sixteen billion, five hundred twenty-five million, three hundred ninety-five thousand, two hundred ninety-one".