16381818072 has 48 divisors (see below), whose sum is σ = 44992331280. Its totient is φ = 5383694400.

The previous prime is 16381818041. The next prime is 16381818077. The reversal of 16381818072 is 27081818361.

It is a happy number.

16381818072 is a `hidden beast` number, since 1 + 638 + 1 + 8 + 1 + 8 + 0 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16381818077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1597179 + ... + 1607402.

It is an arithmetic number, because the mean of its divisors is an integer number (937340235).

Almost surely, 2^16381818072 is an apocalyptic number.

16381818072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16381818072 is an abundant number, since it is smaller than the sum of its proper divisors (28610513208).

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

16381818072 is a wasteful number, since it uses less digits than its factorization.

16381818072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204664 (or 3204657 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 16381818072 in words is "sixteen billion, three hundred eighty-one million, eight hundred eighteen thousand, seventy-two".