81929753051 has 2 divisors, whose sum is σ = 81929753052. Its totient is φ = 81929753050.

The previous prime is 81929753011. The next prime is 81929753069. The reversal of 81929753051 is 15035792918.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81929753051 is a prime.

It is not a weakly prime, because it can be changed into another prime (81929753011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40964876525 + 40964876526.

It is an arithmetic number, because the mean of its divisors is an integer number (40964876526).

Almost surely, 2^81929753051 is an apocalyptic number.

81929753051 is a deficient number, since it is larger than the sum of its proper divisors (1).

81929753051 is an equidigital number, since it uses as much as digits as its factorization.

81929753051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 81929753051 in words is "eighty-one billion, nine hundred twenty-nine million, seven hundred fifty-three thousand, fifty-one".