16504326413 has 2 divisors, whose sum is σ = 16504326414. Its totient is φ = 16504326412.

The previous prime is 16504326409. The next prime is 16504326431. The reversal of 16504326413 is 31462340561.

Together with next prime (16504326431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14161476004 + 2342850409 = 119002^2 + 48403^2 .

It is a cyclic number.

It is not a de Polignac number, because 16504326413 - 2² = 16504326409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16504326403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252163206 + 8252163207.

It is an arithmetic number, because the mean of its divisors is an integer number (8252163207).

Almost surely, 2^16504326413 is an apocalyptic number.

It is an amenable number.

16504326413 is a deficient number, since it is larger than the sum of its proper divisors (1).

16504326413 is an equidigital number, since it uses as much as digits as its factorization.

16504326413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 16504326413 its reverse (31462340561), we get a palindrome (47966666974).

The spelling of 16504326413 in words is "sixteen billion, five hundred four million, three hundred twenty-six thousand, four hundred thirteen".