81151367699 has 2 divisors, whose sum is σ = 81151367700. Its totient is φ = 81151367698.

The previous prime is 81151367651. The next prime is 81151367719. The reversal of 81151367699 is 99676315118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81151367699 - 2¹⁶ = 81151302163 is a prime.

It is not a weakly prime, because it can be changed into another prime (81151367299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40575683849 + 40575683850.

It is an arithmetic number, because the mean of its divisors is an integer number (40575683850).

Almost surely, 2^81151367699 is an apocalyptic number.

81151367699 is a deficient number, since it is larger than the sum of its proper divisors (1).

81151367699 is an equidigital number, since it uses as much as digits as its factorization.

81151367699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 56.

The spelling of 81151367699 in words is "eighty-one billion, one hundred fifty-one million, three hundred sixty-seven thousand, six hundred ninety-nine".