81594785803 has 2 divisors, whose sum is σ = 81594785804. Its totient is φ = 81594785802.

The previous prime is 81594785711. The next prime is 81594785813. The reversal of 81594785803 is 30858749518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81594785803 - 2²⁵ = 81561231371 is a prime.

It is not a weakly prime, because it can be changed into another prime (81594785813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40797392901 + 40797392902.

It is an arithmetic number, because the mean of its divisors is an integer number (40797392902).

Almost surely, 2^81594785803 is an apocalyptic number.

81594785803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81594785803 is an equidigital number, since it uses as much as digits as its factorization.

81594785803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 58.

The spelling of 81594785803 in words is "eighty-one billion, five hundred ninety-four million, seven hundred eighty-five thousand, eight hundred three".