16178145818 has 4 divisors (see below), whose sum is σ = 24267218730. Its totient is φ = 8089072908.

The previous prime is 16178145817. The next prime is 16178145827. The reversal of 16178145818 is 81854187161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81854187161 = 2719 ⋅30104519.

It can be written as a sum of positive squares in only one way, i.e., 11129617009 + 5048528809 = 105497^2 + 71053^2 .

It is not an unprimeable number, because it can be changed into a prime (16178145817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4044536453 + ... + 4044536456.

Almost surely, 2^16178145818 is an apocalyptic number.

16178145818 is a deficient number, since it is larger than the sum of its proper divisors (8089072912).

16178145818 is an equidigital number, since it uses as much as digits as its factorization.

16178145818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8089072911.

The product of its digits is 430080, while the sum is 50.

The spelling of 16178145818 in words is "sixteen billion, one hundred seventy-eight million, one hundred forty-five thousand, eight hundred eighteen".