16309465812 has 72 divisors (see below), whose sum is σ = 42077787752. Its totient is φ = 5325004800.

The previous prime is 16309465789. The next prime is 16309465819. The reversal of 16309465812 is 21856490361.

16309465812 is a `hidden beast` number, since 1 + 63 + 0 + 9 + 4 + 6 + 581 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77686596 + 16231779216 = 8814^2 + 127404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16309465819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 513828 + ... + 544644.

Almost surely, 2^16309465812 is an apocalyptic number.

16309465812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16309465812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21038893876).

16309465812 is an abundant number, since it is smaller than the sum of its proper divisors (25768321940).

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

16309465812 is a wasteful number, since it uses less digits than its factorization.

16309465812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31129 (or 31124 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 16309465812 in words is "sixteen billion, three hundred nine million, four hundred sixty-five thousand, eight hundred twelve".