16393181538 has 16 divisors (see below), whose sum is σ = 33916927680. Its totient is φ = 5275966416.

The previous prime is 16393181537. The next prime is 16393181543. The reversal of 16393181538 is 83518139361.

It is a super-3 number, since 3×16393181538³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16393181537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47106670 + ... + 47107017.

It is an arithmetic number, because the mean of its divisors is an integer number (2119807980).

Almost surely, 2^16393181538 is an apocalyptic number.

16393181538 is an abundant number, since it is smaller than the sum of its proper divisors (17523746142).

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

16393181538 is a wasteful number, since it uses less digits than its factorization.

16393181538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94213721.

The product of its digits is 466560, while the sum is 48.

The spelling of 16393181538 in words is "sixteen billion, three hundred ninety-three million, one hundred eighty-one thousand, five hundred thirty-eight".