81412703945 has 16 divisors (see below), whose sum is σ = 108886343040. Its totient is φ = 58072713984.

The previous prime is 81412703891. The next prime is 81412703947. The reversal of 81412703945 is 54930721418.

It is a cyclic number.

It is not a de Polignac number, because 81412703945 - 2⁸ = 81412703689 is a prime.

It is a super-3 number, since 3×81412703945³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81412703896 and 81412703905.

It is not an unprimeable number, because it can be changed into a prime (81412703947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25203557 + ... + 25206786.

It is an arithmetic number, because the mean of its divisors is an integer number (6805396440).

Almost surely, 2^81412703945 is an apocalyptic number.

81412703945 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81412703945 is a deficient number, since it is larger than the sum of its proper divisors (27473639095).

81412703945 is a wasteful number, since it uses less digits than its factorization.

81412703945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50410384.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 81412703945 in words is "eighty-one billion, four hundred twelve million, seven hundred three thousand, nine hundred forty-five".