81547453157 has 8 divisors (see below), whose sum is σ = 84858211680. Its totient is φ = 78300981360.

The previous prime is 81547453133. The next prime is 81547453171. The reversal of 81547453157 is 75135474518.

It is a happy number.

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 81547453157 - 2²⁰ = 81546404581 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 (81547452157) 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, 16069094 + ... + 16074167.

It is an arithmetic number, because the mean of its divisors is an integer number (10607276460).

Almost surely, 2^81547453157 is an apocalyptic number.

It is an amenable number.

81547453157 is a deficient number, since it is larger than the sum of its proper divisors (3310758523).

81547453157 is a wasteful number, since it uses less digits than its factorization.

81547453157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32143363.

The product of its digits is 2352000, while the sum is 50.

The spelling of 81547453157 in words is "eighty-one billion, five hundred forty-seven million, four hundred fifty-three thousand, one hundred fifty-seven".