81547015561363 has 16 divisors (see below), whose sum is σ = 89424633369600. Its totient is φ = 73746801722880.

The previous prime is 81547015561343. The next prime is 81547015561369. The reversal of 81547015561363 is 36316551074518.

It is not a de Polignac number, because 81547015561363 - 2²⁹ = 81546478690451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81547015561369) 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, 57638998 + ... + 59036836.

It is an arithmetic number, because the mean of its divisors is an integer number (5589039585600).

Almost surely, 2^{81547015561363} is an apocalyptic number.

81547015561363 is a deficient number, since it is larger than the sum of its proper divisors (7877617808237).

81547015561363 is a wasteful number, since it uses less digits than its factorization.

81547015561363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425522.

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 81547015561363 in words is "eighty-one trillion, five hundred forty-seven billion, fifteen million, five hundred sixty-one thousand, three hundred sixty-three".