81547462760399 has 4 divisors (see below), whose sum is σ = 81547557718536. Its totient is φ = 81547367802264.

The previous prime is 81547462760341. The next prime is 81547462760447. The reversal of 81547462760399 is 99306726474518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81547462760399 - 2³² = 81543167793103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81577462760399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46179044 + ... + 47912409.

It is an arithmetic number, because the mean of its divisors is an integer number (20386889429634).

It is a 2-persistent number, because it is pandigital, and so is 2⋅81547462760399 = 163094925520798, but 3⋅81547462760399 = 244642388281197 is not.

Almost surely, 2^{81547462760399} is an apocalyptic number.

81547462760399 is a deficient number, since it is larger than the sum of its proper divisors (94958137).

81547462760399 is an equidigital number, since it uses as much as digits as its factorization.

81547462760399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94958136.

The product of its (nonzero) digits is 548674560, while the sum is 71.

The spelling of 81547462760399 in words is "eighty-one trillion, five hundred forty-seven billion, four hundred sixty-two million, seven hundred sixty thousand, three hundred ninety-nine".