81203530747 has 2 divisors, whose sum is σ = 81203530748. Its totient is φ = 81203530746.

The previous prime is 81203530691. The next prime is 81203530769. The reversal of 81203530747 is 74703530218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81203530747 - 2²⁷ = 81069313019 is a prime.

It is not a weakly prime, because it can be changed into another prime (81203590747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40601765373 + 40601765374.

It is an arithmetic number, because the mean of its divisors is an integer number (40601765374).

Almost surely, 2^81203530747 is an apocalyptic number.

81203530747 is a deficient number, since it is larger than the sum of its proper divisors (1).

81203530747 is an equidigital number, since it uses as much as digits as its factorization.

81203530747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 81203530747 in words is "eighty-one billion, two hundred three million, five hundred thirty thousand, seven hundred forty-seven".