81348157447 has 2 divisors, whose sum is σ = 81348157448. Its totient is φ = 81348157446.

The previous prime is 81348157391. The next prime is 81348157463. The reversal of 81348157447 is 74475184318.

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-81348157447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81348157394 and 81348157403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81348152447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40674078723 + 40674078724.

It is an arithmetic number, because the mean of its divisors is an integer number (40674078724).

Almost surely, 2^81348157447 is an apocalyptic number.

81348157447 is a deficient number, since it is larger than the sum of its proper divisors (1).

81348157447 is an equidigital number, since it uses as much as digits as its factorization.

81348157447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3010560, while the sum is 52.

The spelling of 81348157447 in words is "eighty-one billion, three hundred forty-eight million, one hundred fifty-seven thousand, four hundred forty-seven".