81252935479 has 2 divisors, whose sum is σ = 81252935480. Its totient is φ = 81252935478.

The previous prime is 81252935447. The next prime is 81252935501. The reversal of 81252935479 is 97453925218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81252935479 - 2⁵ = 81252935447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81252935419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40626467739 + 40626467740.

It is an arithmetic number, because the mean of its divisors is an integer number (40626467740).

Almost surely, 2^81252935479 is an apocalyptic number.

81252935479 is a deficient number, since it is larger than the sum of its proper divisors (1).

81252935479 is an equidigital number, since it uses as much as digits as its factorization.

81252935479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 55.

The spelling of 81252935479 in words is "eighty-one billion, two hundred fifty-two million, nine hundred thirty-five thousand, four hundred seventy-nine".