16661176075477 has 2 divisors, whose sum is σ = 16661176075478. Its totient is φ = 16661176075476.

The previous prime is 16661176075459. The next prime is 16661176075519. The reversal of 16661176075477 is 77457067116661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16268847973156 + 392328102321 = 4033466^2 + 626361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661176075477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16661176075447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330588037738 + 8330588037739.

It is an arithmetic number, because the mean of its divisors is an integer number (8330588037739).

Almost surely, 2^{16661176075477} is an apocalyptic number.

It is an amenable number.

16661176075477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661176075477 is an equidigital number, since it uses as much as digits as its factorization.

16661176075477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62233920, while the sum is 64.

The spelling of 16661176075477 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-six million, seventy-five thousand, four hundred seventy-seven".