16504509851 has 2 divisors, whose sum is σ = 16504509852. Its totient is φ = 16504509850.

The previous prime is 16504509803. The next prime is 16504509869. The reversal of 16504509851 is 15890540561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16504509851 - 2³⁰ = 15430768027 is a prime.

It is not a weakly prime, because it can be changed into another prime (16504509871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252254925 + 8252254926.

It is an arithmetic number, because the mean of its divisors is an integer number (8252254926).

Almost surely, 2^16504509851 is an apocalyptic number.

16504509851 is a deficient number, since it is larger than the sum of its proper divisors (1).

16504509851 is an equidigital number, since it uses as much as digits as its factorization.

16504509851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 16504509851 in words is "sixteen billion, five hundred four million, five hundred nine thousand, eight hundred fifty-one".