81734377633 has 2 divisors, whose sum is σ = 81734377634. Its totient is φ = 81734377632.

The previous prime is 81734377609. The next prime is 81734377643. The reversal of 81734377633 is 33677343718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74480959744 + 7253417889 = 272912^2 + 85167^2 .

It is a cyclic number.

It is not a de Polignac number, because 81734377633 - 2¹³ = 81734369441 is a prime.

It is not a weakly prime, because it can be changed into another prime (81734377643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40867188816 + 40867188817.

It is an arithmetic number, because the mean of its divisors is an integer number (40867188817).

Almost surely, 2^81734377633 is an apocalyptic number.

It is an amenable number.

81734377633 is a deficient number, since it is larger than the sum of its proper divisors (1).

81734377633 is an equidigital number, since it uses as much as digits as its factorization.

81734377633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 52.

The spelling of 81734377633 in words is "eighty-one billion, seven hundred thirty-four million, three hundred seventy-seven thousand, six hundred thirty-three".