81547453238 has 8 divisors (see below), whose sum is σ = 129516543432. Its totient is φ = 38375272096.

The previous prime is 81547453223. The next prime is 81547453261. The reversal of 81547453238 is 83235474518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199227220 + ... + 1199227287.

It is an arithmetic number, because the mean of its divisors is an integer number (16189567929).

Almost surely, 2^81547453238 is an apocalyptic number.

81547453238 is a deficient number, since it is larger than the sum of its proper divisors (47969090194).

81547453238 is a wasteful number, since it uses less digits than its factorization.

81547453238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398454526.

The product of its digits is 3225600, while the sum is 50.

The spelling of 81547453238 in words is "eighty-one billion, five hundred forty-seven million, four hundred fifty-three thousand, two hundred thirty-eight".