16316509781 has 32 divisors (see below), whose sum is σ = 20421652608. Its totient is φ = 12807383040.

The previous prime is 16316509771. The next prime is 16316509789. The reversal of 16316509781 is 18790561361.

16316509781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16316509781 - 2²² = 16312315477 is a prime.

It is a super-2 number, since 2×16316509781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16316509789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 375665 + ... + 416841.

It is an arithmetic number, because the mean of its divisors is an integer number (638176644).

Almost surely, 2^16316509781 is an apocalyptic number.

16316509781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16316509781 is a deficient number, since it is larger than the sum of its proper divisors (4105142827).

16316509781 is a wasteful number, since it uses less digits than its factorization.

16316509781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41381.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 16316509781 in words is "sixteen billion, three hundred sixteen million, five hundred nine thousand, seven hundred eighty-one".