81275325051 has 16 divisors (see below), whose sum is σ = 110035587200. Its totient is φ = 53350057728.

The previous prime is 81275324981. The next prime is 81275325067. The reversal of 81275325051 is 15052357218.

It is not a de Polignac number, because 81275325051 - 2¹⁸ = 81275062907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81275325251) 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 in 15 ways as a sum of consecutive naturals, for example, 345195 + ... + 530763.

It is an arithmetic number, because the mean of its divisors is an integer number (6877224200).

Almost surely, 2^81275325051 is an apocalyptic number.

81275325051 is a deficient number, since it is larger than the sum of its proper divisors (28760262149).

81275325051 is a wasteful number, since it uses less digits than its factorization.

81275325051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187818.

The product of its (nonzero) digits is 84000, while the sum is 39.

The spelling of 81275325051 in words is "eighty-one billion, two hundred seventy-five million, three hundred twenty-five thousand, fifty-one".