81929753011 has 2 divisors, whose sum is σ = 81929753012. Its totient is φ = 81929753010.

The previous prime is 81929752991. The next prime is 81929753051. The reversal of 81929753011 is 11035792918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81929753011 - 2²³ = 81921364403 is a prime.

It is a super-2 number, since 2×81929753011² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81929753051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40964876505 + 40964876506.

It is an arithmetic number, because the mean of its divisors is an integer number (40964876506).

Almost surely, 2^81929753011 is an apocalyptic number.

81929753011 is a deficient number, since it is larger than the sum of its proper divisors (1).

81929753011 is an equidigital number, since it uses as much as digits as its factorization.

81929753011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 81929753011 in words is "eighty-one billion, nine hundred twenty-nine million, seven hundred fifty-three thousand, eleven".