215428733791 has 2 divisors, whose sum is σ = 215428733792. Its totient is φ = 215428733790.

The previous prime is 215428733711. The next prime is 215428733813. The reversal of 215428733791 is 197337824512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215428733791 - 2²⁵ = 215395179359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215428733711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107714366895 + 107714366896.

It is an arithmetic number, because the mean of its divisors is an integer number (107714366896).

Almost surely, 2^215428733791 is an apocalyptic number.

215428733791 is a deficient number, since it is larger than the sum of its proper divisors (1).

215428733791 is an equidigital number, since it uses as much as digits as its factorization.

215428733791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The spelling of 215428733791 in words is "two hundred fifteen billion, four hundred twenty-eight million, seven hundred thirty-three thousand, seven hundred ninety-one".