81201275355361 has 16 divisors (see below), whose sum is σ = 92823739384320. Its totient is φ = 69584383411200.

The previous prime is 81201275355353. The next prime is 81201275355373. The reversal of 81201275355361 is 16355357210218.

It is not a de Polignac number, because 81201275355361 - 2³ = 81201275355353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81201275355341) 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, 728605480 + ... + 728716918.

It is an arithmetic number, because the mean of its divisors is an integer number (5801483711520).

Almost surely, 2^{81201275355361} is an apocalyptic number.

It is an amenable number.

81201275355361 is a deficient number, since it is larger than the sum of its proper divisors (11622464028959).

81201275355361 is a wasteful number, since it uses less digits than its factorization.

81201275355361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135504.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 81201275355361 in words is "eighty-one trillion, two hundred one billion, two hundred seventy-five million, three hundred fifty-five thousand, three hundred sixty-one".