81034840699 has 2 divisors, whose sum is σ = 81034840700. Its totient is φ = 81034840698.

The previous prime is 81034840669. The next prime is 81034840717. The reversal of 81034840699 is 99604843018.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81034840699 - 2¹⁹ = 81034316411 is a prime.

It is a super-2 number, since 2×81034840699² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81034840669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40517420349 + 40517420350.

It is an arithmetic number, because the mean of its divisors is an integer number (40517420350).

Almost surely, 2^81034840699 is an apocalyptic number.

81034840699 is a deficient number, since it is larger than the sum of its proper divisors (1).

81034840699 is an equidigital number, since it uses as much as digits as its factorization.

81034840699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 81034840699 in words is "eighty-one billion, thirty-four million, eight hundred forty thousand, six hundred ninety-nine".