81447104803 has 2 divisors, whose sum is σ = 81447104804. Its totient is φ = 81447104802.

The previous prime is 81447104723. The next prime is 81447104821. The reversal of 81447104803 is 30840174418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81447104803 is a prime.

It is not a weakly prime, because it can be changed into another prime (81447104003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40723552401 + 40723552402.

It is an arithmetic number, because the mean of its divisors is an integer number (40723552402).

Almost surely, 2^81447104803 is an apocalyptic number.

81447104803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81447104803 is an equidigital number, since it uses as much as digits as its factorization.

81447104803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 81447104803 in words is "eighty-one billion, four hundred forty-seven million, one hundred four thousand, eight hundred three".