81562235011555 has 8 divisors (see below), whose sum is σ = 98366514588000. Its totient is φ = 64921899626496.

The previous prime is 81562235011553. The next prime is 81562235011589. The reversal of 81562235011555 is 55511053226518.

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

It is a cyclic number.

It is not a de Polignac number, because 81562235011555 - 2¹ = 81562235011553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81562235011499 and 81562235011508.

It is not an unprimeable number, because it can be changed into a prime (81562235011553) 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 7 ways as a sum of consecutive naturals, for example, 40986046750 + ... + 40986048739.

It is an arithmetic number, because the mean of its divisors is an integer number (12295814323500).

Almost surely, 2^{81562235011555} is an apocalyptic number.

81562235011555 is a deficient number, since it is larger than the sum of its proper divisors (16804279576445).

81562235011555 is a wasteful number, since it uses less digits than its factorization.

81562235011555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81972095693.

The product of its (nonzero) digits is 1800000, while the sum is 49.

The spelling of 81562235011555 in words is "eighty-one trillion, five hundred sixty-two billion, two hundred thirty-five million, eleven thousand, five hundred fifty-five".