81598894423 has 2 divisors, whose sum is σ = 81598894424. Its totient is φ = 81598894422.

The previous prime is 81598894409. The next prime is 81598894459. The reversal of 81598894423 is 32449889518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81598894423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81598894523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40799447211 + 40799447212.

It is an arithmetic number, because the mean of its divisors is an integer number (40799447212).

Almost surely, 2^81598894423 is an apocalyptic number.

81598894423 is a deficient number, since it is larger than the sum of its proper divisors (1).

81598894423 is an equidigital number, since it uses as much as digits as its factorization.

81598894423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19906560, while the sum is 61.

The spelling of 81598894423 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred ninety-four thousand, four hundred twenty-three".