81073105300813 has 4 divisors (see below), whose sum is σ = 81156945121120. Its totient is φ = 80989265480508.

The previous prime is 81073105300807. The next prime is 81073105300843. The reversal of 81073105300813 is 31800350137018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81073105300813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073105300843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41919908703 + ... + 41919910636.

It is an arithmetic number, because the mean of its divisors is an integer number (20289236280280).

Almost surely, 2^{81073105300813} is an apocalyptic number.

It is an amenable number.

81073105300813 is a deficient number, since it is larger than the sum of its proper divisors (83839820307).

81073105300813 is an equidigital number, since it uses as much as digits as its factorization.

81073105300813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83839820306.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 81073105300813 in words is "eighty-one trillion, seventy-three billion, one hundred five million, three hundred thousand, eight hundred thirteen".