16809769856 has 32 divisors (see below), whose sum is σ = 36532599480. Its totient is φ = 7640803840.

The previous prime is 16809769853. The next prime is 16809769859. The reversal of 16809769856 is 65896790861.

It is an interprime number because it is at equal distance from previous prime (16809769853) and next prime (16809769859).

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×16809769856² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16809769792 and 16809769801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16809769853) 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, 5967971 + ... + 5970786.

Almost surely, 2^16809769856 is an apocalyptic number.

16809769856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16809769856 is an abundant number, since it is smaller than the sum of its proper divisors (19722829624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16809769856 is a wasteful number, since it uses less digits than its factorization.

16809769856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11938782 (or 11938770 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 16809769856 in words is "sixteen billion, eight hundred nine million, seven hundred sixty-nine thousand, eight hundred fifty-six".