16478635861 has 2 divisors, whose sum is σ = 16478635862. Its totient is φ = 16478635860.

The previous prime is 16478635829. The next prime is 16478635871. The reversal of 16478635861 is 16853687461.

16478635861 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., 16101072100 + 377563761 = 126890^2 + 19431^2 .

It is a cyclic number.

It is not a de Polignac number, because 16478635861 - 2⁵ = 16478635829 is a prime.

It is a super-2 number, since 2×16478635861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16478635871) 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 as a sum of consecutive naturals, namely, 8239317930 + 8239317931.

It is an arithmetic number, because the mean of its divisors is an integer number (8239317931).

Almost surely, 2^16478635861 is an apocalyptic number.

It is an amenable number.

16478635861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16478635861 is an equidigital number, since it uses as much as digits as its factorization.

16478635861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The spelling of 16478635861 in words is "sixteen billion, four hundred seventy-eight million, six hundred thirty-five thousand, eight hundred sixty-one".