81986572583 has 2 divisors, whose sum is σ = 81986572584. Its totient is φ = 81986572582.

The previous prime is 81986572559. The next prime is 81986572601. The reversal of 81986572583 is 38527568918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81986572583 - 2⁶ = 81986572519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81986572483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40993286291 + 40993286292.

It is an arithmetic number, because the mean of its divisors is an integer number (40993286292).

Almost surely, 2^81986572583 is an apocalyptic number.

81986572583 is a deficient number, since it is larger than the sum of its proper divisors (1).

81986572583 is an equidigital number, since it uses as much as digits as its factorization.

81986572583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 62.

The spelling of 81986572583 in words is "eighty-one billion, nine hundred eighty-six million, five hundred seventy-two thousand, five hundred eighty-three".