81650132751 has 32 divisors (see below), whose sum is σ = 122966449920. Its totient is φ = 47736819200.

The previous prime is 81650132717. The next prime is 81650132777. The reversal of 81650132751 is 15723105618.

It is a cyclic number.

It is not a de Polignac number, because 81650132751 - 2²² = 81645938447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650136751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1076311 + ... + 1149671.

It is an arithmetic number, because the mean of its divisors is an integer number (3842701560).

Almost surely, 2^81650132751 is an apocalyptic number.

81650132751 is a deficient number, since it is larger than the sum of its proper divisors (41316317169).

81650132751 is a wasteful number, since it uses less digits than its factorization.

81650132751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74567.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 81650132751 in words is "eighty-one billion, six hundred fifty million, one hundred thirty-two thousand, seven hundred fifty-one".