81648051851 has 2 divisors, whose sum is σ = 81648051852. Its totient is φ = 81648051850.

The previous prime is 81648051839. The next prime is 81648051857. The reversal of 81648051851 is 15815084618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81648051851 - 2¹⁴ = 81648035467 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81648051796 and 81648051805.

It is not a weakly prime, because it can be changed into another prime (81648051857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40824025925 + 40824025926.

It is an arithmetic number, because the mean of its divisors is an integer number (40824025926).

Almost surely, 2^81648051851 is an apocalyptic number.

81648051851 is a deficient number, since it is larger than the sum of its proper divisors (1).

81648051851 is an equidigital number, since it uses as much as digits as its factorization.

81648051851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 307200, while the sum is 47.

The spelling of 81648051851 in words is "eighty-one billion, six hundred forty-eight million, fifty-one thousand, eight hundred fifty-one".