16523181749 has 2 divisors, whose sum is σ = 16523181750. Its totient is φ = 16523181748.

The previous prime is 16523181737. The next prime is 16523181799. The reversal of 16523181749 is 94718132561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16269002500 + 254179249 = 127550^2 + 15943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16523181749 is a prime.

It is a super-2 number, since 2×16523181749² (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 (16523181799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8261590874 + 8261590875.

It is an arithmetic number, because the mean of its divisors is an integer number (8261590875).

Almost surely, 2^16523181749 is an apocalyptic number.

It is an amenable number.

16523181749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16523181749 is an equidigital number, since it uses as much as digits as its factorization.

16523181749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The spelling of 16523181749 in words is "sixteen billion, five hundred twenty-three million, one hundred eighty-one thousand, seven hundred forty-nine".