81750162293 has 2 divisors, whose sum is σ = 81750162294. Its totient is φ = 81750162292.

The previous prime is 81750162287. The next prime is 81750162331. The reversal of 81750162293 is 39226105718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43331418244 + 38418744049 = 208162^2 + 196007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81750162293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81750162203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40875081146 + 40875081147.

It is an arithmetic number, because the mean of its divisors is an integer number (40875081147).

Almost surely, 2^81750162293 is an apocalyptic number.

It is an amenable number.

81750162293 is a deficient number, since it is larger than the sum of its proper divisors (1).

81750162293 is an equidigital number, since it uses as much as digits as its factorization.

81750162293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 81750162293 in words is "eighty-one billion, seven hundred fifty million, one hundred sixty-two thousand, two hundred ninety-three".