16402018777 has 2 divisors, whose sum is σ = 16402018778. Its totient is φ = 16402018776.

The previous prime is 16402018757. The next prime is 16402018861. The reversal of 16402018777 is 77781020461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16376576841 + 25441936 = 127971^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 16402018777 - 2⁷ = 16402018649 is a prime.

It is a super-3 number, since 3×16402018777³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (16402018747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8201009388 + 8201009389.

It is an arithmetic number, because the mean of its divisors is an integer number (8201009389).

Almost surely, 2^16402018777 is an apocalyptic number.

It is an amenable number.

16402018777 is a deficient number, since it is larger than the sum of its proper divisors (1).

16402018777 is an equidigital number, since it uses as much as digits as its factorization.

16402018777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131712, while the sum is 43.

The spelling of 16402018777 in words is "sixteen billion, four hundred two million, eighteen thousand, seven hundred seventy-seven".