81043377470 has 32 divisors (see below), whose sum is σ = 159153724800. Its totient is φ = 29467726240.

The previous prime is 81043377419. The next prime is 81043377479. The reversal of 81043377470 is 7477334018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043377479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591829 + ... + 1641951.

It is an arithmetic number, because the mean of its divisors is an integer number (4973553900).

Almost surely, 2^81043377470 is an apocalyptic number.

81043377470 is a deficient number, since it is larger than the sum of its proper divisors (78110347330).

81043377470 is a wasteful number, since it uses less digits than its factorization.

81043377470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64840.

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 81043377470 in words is "eighty-one billion, forty-three million, three hundred seventy-seven thousand, four hundred seventy".