81800751247351 has 16 divisors (see below), whose sum is σ = 91730448000000. Its totient is φ = 72489427106688.

The previous prime is 81800751247183. The next prime is 81800751247361. The reversal of 81800751247351 is 15374215700818.

It is a cyclic number.

It is not a de Polignac number, because 81800751247351 - 2⁹ = 81800751246839 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 (81800751247361) 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, 776797351 + ... + 776902648.

It is an arithmetic number, because the mean of its divisors is an integer number (5733153000000).

Almost surely, 2^{81800751247351} is an apocalyptic number.

81800751247351 is a deficient number, since it is larger than the sum of its proper divisors (9929696752649).

81800751247351 is a wasteful number, since it uses less digits than its factorization.

81800751247351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553700198.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 81800751247351 in words is "eighty-one trillion, eight hundred billion, seven hundred fifty-one million, two hundred forty-seven thousand, three hundred fifty-one".