81388513343 has 2 divisors, whose sum is σ = 81388513344. Its totient is φ = 81388513342.

The previous prime is 81388513279. The next prime is 81388513399. The reversal of 81388513343 is 34331588318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81388513343 - 2⁶ = 81388513279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81388516343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40694256671 + 40694256672.

It is an arithmetic number, because the mean of its divisors is an integer number (40694256672).

Almost surely, 2^81388513343 is an apocalyptic number.

81388513343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81388513343 is an equidigital number, since it uses as much as digits as its factorization.

81388513343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The spelling of 81388513343 in words is "eighty-one billion, three hundred eighty-eight million, five hundred thirteen thousand, three hundred forty-three".