81556703 has 8 divisors (see below), whose sum is σ = 84706560. Its totient is φ = 78465880.

The previous prime is 81556697. The next prime is 81556723. The reversal of 81556703 is 30765518.

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 81556703 - 2⁴ = 81556687 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 (81556723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11933 + ... + 17478.

It is an arithmetic number, because the mean of its divisors is an integer number (10588320).

Almost surely, 2^81556703 is an apocalyptic number.

81556703 is a deficient number, since it is larger than the sum of its proper divisors (3149857).

81556703 is a wasteful number, since it uses less digits than its factorization.

81556703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29517.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 81556703 is about 9030.8749852935. The cubic root of 81556703 is about 433.6638491569.

The spelling of 81556703 in words is "eighty-one million, five hundred fifty-six thousand, seven hundred three".