16620277231 has 2 divisors, whose sum is σ = 16620277232. Its totient is φ = 16620277230.

The previous prime is 16620277229. The next prime is 16620277237. The reversal of 16620277231 is 13277202661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13277202661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16620277231 - 2¹ = 16620277229 is a prime.

It is a super-2 number, since 2×16620277231² (a number of 21 digits) contains 22 as substring.

Together with 16620277229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16620277237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310138615 + 8310138616.

It is an arithmetic number, because the mean of its divisors is an integer number (8310138616).

Almost surely, 2^16620277231 is an apocalyptic number.

16620277231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16620277231 is an equidigital number, since it uses as much as digits as its factorization.

16620277231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

Adding to 16620277231 its reverse (13277202661), we get a palindrome (29897479892).

The spelling of 16620277231 in words is "sixteen billion, six hundred twenty million, two hundred seventy-seven thousand, two hundred thirty-one".