16618378057 has 4 divisors (see below), whose sum is σ = 16625691540. Its totient is φ = 16611064576.

The previous prime is 16618378037. The next prime is 16618378093. The reversal of 16618378057 is 75087381661.

16618378057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7482077001 + 9136301056 = 86499^2 + 95584^2 .

It is a cyclic number.

It is not a de Polignac number, because 16618378057 - 2⁷ = 16618377929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16618377995 and 16618378013.

It is not an unprimeable number, because it can be changed into a prime (16618378037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653332 + ... + 3657877.

It is an arithmetic number, because the mean of its divisors is an integer number (4156422885).

Almost surely, 2^16618378057 is an apocalyptic number.

It is an amenable number.

16618378057 is a deficient number, since it is larger than the sum of its proper divisors (7313483).

16618378057 is an equidigital number, since it uses as much as digits as its factorization.

16618378057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313482.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 16618378057 in words is "sixteen billion, six hundred eighteen million, three hundred seventy-eight thousand, fifty-seven".