81547453258 has 16 divisors (see below), whose sum is σ = 127738607040. Its totient is φ = 38970670816.

The previous prime is 81547453223. The next prime is 81547453261. The reversal of 81547453258 is 85235474518.

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, 628360 + ... + 746947.

It is an arithmetic number, because the mean of its divisors is an integer number (7983662940).

Almost surely, 2^81547453258 is an apocalyptic number.

81547453258 is a deficient number, since it is larger than the sum of its proper divisors (46191153782).

81547453258 is a wasteful number, since it uses less digits than its factorization.

81547453258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376621.

The product of its digits is 5376000, while the sum is 52.

The spelling of 81547453258 in words is "eighty-one billion, five hundred forty-seven million, four hundred fifty-three thousand, two hundred fifty-eight".