16311113506 has 4 divisors (see below), whose sum is σ = 24466670262. Its totient is φ = 8155556752.

The previous prime is 16311113453. The next prime is 16311113531. The reversal of 16311113506 is 60531111361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14306312881 + 2004800625 = 119609^2 + 44775^2 .

It is a super-2 number, since 2×16311113506² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4077778375 + ... + 4077778378.

Almost surely, 2^16311113506 is an apocalyptic number.

16311113506 is a deficient number, since it is larger than the sum of its proper divisors (8155556756).

16311113506 is an equidigital number, since it uses as much as digits as its factorization.

16311113506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8155556755.

The product of its (nonzero) digits is 1620, while the sum is 28.

Adding to 16311113506 its reverse (60531111361), we get a palindrome (76842224867).

The spelling of 16311113506 in words is "sixteen billion, three hundred eleven million, one hundred thirteen thousand, five hundred six".