81547453158 has 16 divisors (see below), whose sum is σ = 163105916016. Its totient is φ = 27180649440.

The previous prime is 81547453133. The next prime is 81547453171. The reversal of 81547453158 is 85135474518.

It is a self number, because there is not a number n which added to its sum of digits gives 81547453158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360841 + ... + 541572.

It is an arithmetic number, because the mean of its divisors is an integer number (10194119751).

Almost surely, 2^81547453158 is an apocalyptic number.

81547453158 is an abundant number, since it is smaller than the sum of its proper divisors (81558462858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81547453158 is a wasteful number, since it uses less digits than its factorization.

81547453158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917479.

The product of its digits is 2688000, while the sum is 51.

The spelling of 81547453158 in words is "eighty-one billion, five hundred forty-seven million, four hundred fifty-three thousand, one hundred fifty-eight".