81598894607 has 2 divisors, whose sum is σ = 81598894608. Its totient is φ = 81598894606.

The previous prime is 81598894567. The next prime is 81598894631. The reversal of 81598894607 is 70649889518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81598894607 - 2¹² = 81598890511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81598894687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40799447303 + 40799447304.

It is an arithmetic number, because the mean of its divisors is an integer number (40799447304).

Almost surely, 2^81598894607 is an apocalyptic number.

81598894607 is a deficient number, since it is larger than the sum of its proper divisors (1).

81598894607 is an equidigital number, since it uses as much as digits as its factorization.

81598894607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 65.

The spelling of 81598894607 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred ninety-four thousand, six hundred seven".