81298470705 has 16 divisors (see below), whose sum is σ = 133593163584. Its totient is φ = 42187314240.

The previous prime is 81298470647. The next prime is 81298470769. The reversal of 81298470705 is 50707489218.

It is not a de Polignac number, because 81298470705 - 2⁷ = 81298470577 is a prime.

It is an unprimeable number.

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, 73241311 + ... + 73242420.

It is an arithmetic number, because the mean of its divisors is an integer number (8349572724).

Almost surely, 2^81298470705 is an apocalyptic number.

It is an amenable number.

81298470705 is a deficient number, since it is larger than the sum of its proper divisors (52294692879).

81298470705 is a wasteful number, since it uses less digits than its factorization.

81298470705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146483776.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 81298470705 in words is "eighty-one billion, two hundred ninety-eight million, four hundred seventy thousand, seven hundred five".