81235454904512 has 14 divisors (see below), whose sum is σ = 161201605826268. Its totient is φ = 40617727452224.

The previous prime is 81235454904503. The next prime is 81235454904589. The reversal of 81235454904512 is 21540945453218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634651991378 + ... + 634651991505.

It is an arithmetic number, because the mean of its divisors is an integer number (11514400416162).

Almost surely, 2^{81235454904512} is an apocalyptic number.

It is an amenable number.

81235454904512 is a deficient number, since it is larger than the sum of its proper divisors (79966150921756).

81235454904512 is a wasteful number, since it uses less digits than its factorization.

81235454904512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269303982895 (or 1269303982885 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 53.

The spelling of 81235454904512 in words is "eighty-one trillion, two hundred thirty-five billion, four hundred fifty-four million, nine hundred four thousand, five hundred twelve".