16638077 has 2 divisors, whose sum is σ = 16638078. Its totient is φ = 16638076.

The previous prime is 16638023. The next prime is 16638079. The reversal of 16638077 is 77083661.

16638077 = 2354² + 2355² + 2356².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14661241 + 1976836 = 3829^2 + 1406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16638077 is a prime.

Together with 16638079, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16638077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16638079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8319038 + 8319039.

It is an arithmetic number, because the mean of its divisors is an integer number (8319039).

Almost surely, 2^16638077 is an apocalyptic number.

It is an amenable number.

16638077 is a deficient number, since it is larger than the sum of its proper divisors (1).

16638077 is an equidigital number, since it uses as much as digits as its factorization.

16638077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 16638077 is about 4078.9798969840. The cubic root of 16638077 is about 255.2903369956.

The spelling of 16638077 in words is "sixteen million, six hundred thirty-eight thousand, seventy-seven".