81125988479 has 2 divisors, whose sum is σ = 81125988480. Its totient is φ = 81125988478.

The previous prime is 81125988421. The next prime is 81125988481. The reversal of 81125988479 is 97488952118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81125988479 - 2²⁴ = 81109211263 is a prime.

Together with 81125988481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81125988179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40562994239 + 40562994240.

It is an arithmetic number, because the mean of its divisors is an integer number (40562994240).

Almost surely, 2^81125988479 is an apocalyptic number.

81125988479 is a deficient number, since it is larger than the sum of its proper divisors (1).

81125988479 is an equidigital number, since it uses as much as digits as its factorization.

81125988479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 62.

The spelling of 81125988479 in words is "eighty-one billion, one hundred twenty-five million, nine hundred eighty-eight thousand, four hundred seventy-nine".