81107751257371 has 2 divisors, whose sum is σ = 81107751257372. Its totient is φ = 81107751257370.

The previous prime is 81107751257297. The next prime is 81107751257443. The reversal of 81107751257371 is 17375215770118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81107751257371 - 2¹³ = 81107751249179 is a prime.

It is not a weakly prime, because it can be changed into another prime (81107751657371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553875628685 + 40553875628686.

It is an arithmetic number, because the mean of its divisors is an integer number (40553875628686).

Almost surely, 2^{81107751257371} is an apocalyptic number.

81107751257371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81107751257371 is an equidigital number, since it uses as much as digits as its factorization.

81107751257371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2881200, while the sum is 55.

The spelling of 81107751257371 in words is "eighty-one trillion, one hundred seven billion, seven hundred fifty-one million, two hundred fifty-seven thousand, three hundred seventy-one".