81006449347 has 8 divisors (see below), whose sum is σ = 82177597440. Its totient is φ = 79838945160.

The previous prime is 81006449341. The next prime is 81006449371. The reversal of 81006449347 is 74394460018.

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 81006449347 - 2⁷ = 81006449219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81006449297 and 81006449306.

It is not an unprimeable number, because it can be changed into a prime (81006449341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 866179 + ... + 955132.

It is an arithmetic number, because the mean of its divisors is an integer number (10272199680).

Almost surely, 2^81006449347 is an apocalyptic number.

81006449347 is a deficient number, since it is larger than the sum of its proper divisors (1171148093).

81006449347 is a wasteful number, since it uses less digits than its factorization.

81006449347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821953.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 81006449347 in words is "eighty-one billion, six million, four hundred forty-nine thousand, three hundred forty-seven".