81473891512064 has 36 divisors (see below), whose sum is σ = 162677914596960. Its totient is φ = 40724824842240.

The previous prime is 81473891512003. The next prime is 81473891512093. The reversal of 81473891512064 is 46021519837418.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81473891511994 and 81473891512012.

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, 46485224 + ... + 48206055.

It is a 1-persistent number, because it is pandigital, but 2⋅81473891512064 = 162947783024128 is not.

Almost surely, 2^{81473891512064} is an apocalyptic number.

It is an amenable number.

81473891512064 is a deficient number, since it is larger than the sum of its proper divisors (81204023084896).

81473891512064 is an equidigital number, since it uses as much as digits as its factorization.

81473891512064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94694656 (or 94694642 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 81473891512064 in words is "eighty-one trillion, four hundred seventy-three billion, eight hundred ninety-one million, five hundred twelve thousand, sixty-four".