81075265745 has 8 divisors (see below), whose sum is σ = 97827835560. Its totient is φ = 64501868160.

The previous prime is 81075265679. The next prime is 81075265759. The reversal of 81075265745 is 54756257018.

It can be written as a sum of positive squares in 4 ways, for example, as 1643734849 + 79431530896 = 40543^2 + 281836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81075265745 - 2¹⁸ = 81075003601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81075265693 and 81075265702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44792060 + ... + 44793869.

It is an arithmetic number, because the mean of its divisors is an integer number (12228479445).

Almost surely, 2^81075265745 is an apocalyptic number.

It is an amenable number.

81075265745 is a deficient number, since it is larger than the sum of its proper divisors (16752569815).

81075265745 is a wasteful number, since it uses less digits than its factorization.

81075265745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89586115.

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 81075265745 in words is "eighty-one billion, seventy-five million, two hundred sixty-five thousand, seven hundred forty-five".