216939379523 has 2 divisors, whose sum is σ = 216939379524. Its totient is φ = 216939379522.

The previous prime is 216939379519. The next prime is 216939379603. The reversal of 216939379523 is 325973939612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216939379523 - 2² = 216939379519 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (216939319523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108469689761 + 108469689762.

It is an arithmetic number, because the mean of its divisors is an integer number (108469689762).

Almost surely, 2^216939379523 is an apocalyptic number.

216939379523 is a deficient number, since it is larger than the sum of its proper divisors (1).

216939379523 is an equidigital number, since it uses as much as digits as its factorization.

216939379523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16533720, while the sum is 59.

The spelling of 216939379523 in words is "two hundred sixteen billion, nine hundred thirty-nine million, three hundred seventy-nine thousand, five hundred twenty-three".