16806078257 has 2 divisors, whose sum is σ = 16806078258. Its totient is φ = 16806078256.

The previous prime is 16806078209. The next prime is 16806078281. The reversal of 16806078257 is 75287060861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16579395121 + 226683136 = 128761^2 + 15056^2 .

It is a cyclic number.

It is not a de Polignac number, because 16806078257 - 2⁸ = 16806078001 is a prime.

It is a super-4 number, since 4×16806078257⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (16806077257) 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, 8403039128 + 8403039129.

It is an arithmetic number, because the mean of its divisors is an integer number (8403039129).

Almost surely, 2^16806078257 is an apocalyptic number.

It is an amenable number.

16806078257 is a deficient number, since it is larger than the sum of its proper divisors (1).

16806078257 is an equidigital number, since it uses as much as digits as its factorization.

16806078257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 16806078257 in words is "sixteen billion, eight hundred six million, seventy-eight thousand, two hundred fifty-seven".