16851866741 has 2 divisors, whose sum is σ = 16851866742. Its totient is φ = 16851866740.

The previous prime is 16851866687. The next prime is 16851866749. The reversal of 16851866741 is 14766815861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10590468100 + 6261398641 = 102910^2 + 79129^2 .

It is a cyclic number.

It is not a de Polignac number, because 16851866741 - 2⁶ = 16851866677 is a prime.

It is a super-2 number, since 2×16851866741² (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 (16851866749) 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, 8425933370 + 8425933371.

It is an arithmetic number, because the mean of its divisors is an integer number (8425933371).

Almost surely, 2^16851866741 is an apocalyptic number.

It is an amenable number.

16851866741 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851866741 is an equidigital number, since it uses as much as digits as its factorization.

16851866741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 53.

The spelling of 16851866741 in words is "sixteen billion, eight hundred fifty-one million, eight hundred sixty-six thousand, seven hundred forty-one".