81929753050 has 24 divisors (see below), whose sum is σ = 156507975036. Its totient is φ = 31886173440.

The previous prime is 81929753011. The next prime is 81929753051. The reversal of 81929753050 is 5035792918.

It can be written as a sum of positive squares in 6 ways, for example, as 73020469729 + 8909283321 = 270223^2 + 94389^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81929752985 and 81929753003.

It is not an unprimeable number, because it can be changed into a prime (81929753051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22141327 + ... + 22145026.

Almost surely, 2^81929753050 is an apocalyptic number.

81929753050 is a deficient number, since it is larger than the sum of its proper divisors (74578221986).

81929753050 is a wasteful number, since it uses less digits than its factorization.

81929753050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44286402 (or 44286397 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 81929753050 in words is "eighty-one billion, nine hundred twenty-nine million, seven hundred fifty-three thousand, fifty".