216954978439 has 2 divisors, whose sum is σ = 216954978440. Its totient is φ = 216954978438.

The previous prime is 216954978433. The next prime is 216954978467. The reversal of 216954978439 is 934879459612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216954978439 - 2³³ = 208365043847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216954978433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108477489219 + 108477489220.

It is an arithmetic number, because the mean of its divisors is an integer number (108477489220).

Almost surely, 2^216954978439 is an apocalyptic number.

216954978439 is a deficient number, since it is larger than the sum of its proper divisors (1).

216954978439 is an equidigital number, since it uses as much as digits as its factorization.

216954978439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 67.

The spelling of 216954978439 in words is "two hundred sixteen billion, nine hundred fifty-four million, nine hundred seventy-eight thousand, four hundred thirty-nine".