216157769 has 4 divisors (see below), whose sum is σ = 219821520. Its totient is φ = 212494020.

The previous prime is 216157741. The next prime is 216157783. The reversal of 216157769 is 967751612.

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 216157769 - 2¹² = 216153673 is a prime.

It is a super-2 number, since 2×216157769² = 93448362198114722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216157789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831787 + ... + 1831904.

It is an arithmetic number, because the mean of its divisors is an integer number (54955380).

Almost surely, 2^216157769 is an apocalyptic number.

It is an amenable number.

216157769 is a deficient number, since it is larger than the sum of its proper divisors (3663751).

216157769 is an equidigital number, since it uses as much as digits as its factorization.

216157769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663750.

The product of its digits is 158760, while the sum is 44.

The square root of 216157769 is about 14702.3048873297. The cubic root of 216157769 is about 600.1460468550.

The spelling of 216157769 in words is "two hundred sixteen million, one hundred fifty-seven thousand, seven hundred sixty-nine".