16681477 has 2 divisors, whose sum is σ = 16681478. Its totient is φ = 16681476.

The previous prime is 16681453. The next prime is 16681481. The reversal of 16681477 is 77418661.

16681477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 408321 = 4034^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 16681477 - 2¹⁹ = 16157189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340738 + 8340739.

It is an arithmetic number, because the mean of its divisors is an integer number (8340739).

Almost surely, 2^16681477 is an apocalyptic number.

It is an amenable number.

16681477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681477 is an equidigital number, since it uses as much as digits as its factorization.

16681477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 16681477 is about 4084.2963898326. The cubic root of 16681477 is about 255.5121170515.

The spelling of 16681477 in words is "sixteen million, six hundred eighty-one thousand, four hundred seventy-seven".