16804942949 has 2 divisors, whose sum is σ = 16804942950. Its totient is φ = 16804942948.

The previous prime is 16804942943. The next prime is 16804942981. The reversal of 16804942949 is 94924940861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12562374724 + 4242568225 = 112082^2 + 65135^2 .

It is a cyclic number.

It is not a de Polignac number, because 16804942949 - 2¹² = 16804938853 is a prime.

It is a super-2 number, since 2×16804942949² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16804942894 and 16804942903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16804942943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402471474 + 8402471475.

It is an arithmetic number, because the mean of its divisors is an integer number (8402471475).

Almost surely, 2^16804942949 is an apocalyptic number.

It is an amenable number.

16804942949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16804942949 is an equidigital number, since it uses as much as digits as its factorization.

16804942949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 16804942949 in words is "sixteen billion, eight hundred four million, nine hundred forty-two thousand, nine hundred forty-nine".