216939379529 has 4 divisors (see below), whose sum is σ = 220177280784. Its totient is φ = 213701478276.

The previous prime is 216939379523. The next prime is 216939379603. The reversal of 216939379529 is 925973939612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216939379529 - 2²⁴ = 216922602313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216939379523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618950527 + ... + 1618950660.

It is an arithmetic number, because the mean of its divisors is an integer number (55044320196).

Almost surely, 2^216939379529 is an apocalyptic number.

It is an amenable number.

216939379529 is a deficient number, since it is larger than the sum of its proper divisors (3237901255).

216939379529 is an equidigital number, since it uses as much as digits as its factorization.

216939379529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237901254.

The product of its digits is 49601160, while the sum is 65.

The spelling of 216939379529 in words is "two hundred sixteen billion, nine hundred thirty-nine million, three hundred seventy-nine thousand, five hundred twenty-nine".