81993739963 has 2 divisors, whose sum is σ = 81993739964. Its totient is φ = 81993739962.

The previous prime is 81993739957. The next prime is 81993739969. The reversal of 81993739963 is 36993739918.

It is a balanced prime because it is at equal distance from previous prime (81993739957) and next prime (81993739969).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81993739963 is a prime.

It is not a weakly prime, because it can be changed into another prime (81993739969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40996869981 + 40996869982.

It is an arithmetic number, because the mean of its divisors is an integer number (40996869982).

Almost surely, 2^81993739963 is an apocalyptic number.

81993739963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81993739963 is an equidigital number, since it uses as much as digits as its factorization.

81993739963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59521392, while the sum is 67.

The spelling of 81993739963 in words is "eighty-one billion, nine hundred ninety-three million, seven hundred thirty-nine thousand, nine hundred sixty-three".