81543153847 has 2 divisors, whose sum is σ = 81543153848. Its totient is φ = 81543153846.

The previous prime is 81543153833. The next prime is 81543153907. The reversal of 81543153847 is 74835134518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81543153847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81543153847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81543156847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771576923 + 40771576924.

It is an arithmetic number, because the mean of its divisors is an integer number (40771576924).

Almost surely, 2^81543153847 is an apocalyptic number.

81543153847 is a deficient number, since it is larger than the sum of its proper divisors (1).

81543153847 is an equidigital number, since it uses as much as digits as its factorization.

81543153847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 49.

The spelling of 81543153847 in words is "eighty-one billion, five hundred forty-three million, one hundred fifty-three thousand, eight hundred forty-seven".