81129030767 has 2 divisors, whose sum is σ = 81129030768. Its totient is φ = 81129030766.

The previous prime is 81129030761. The next prime is 81129030847. The reversal of 81129030767 is 76703092118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81129030767 - 2⁸ = 81129030511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81129030761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40564515383 + 40564515384.

It is an arithmetic number, because the mean of its divisors is an integer number (40564515384).

Almost surely, 2^81129030767 is an apocalyptic number.

81129030767 is a deficient number, since it is larger than the sum of its proper divisors (1).

81129030767 is an equidigital number, since it uses as much as digits as its factorization.

81129030767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 81129030767 in words is "eighty-one billion, one hundred twenty-nine million, thirty thousand, seven hundred sixty-seven".