81073331357 has 2 divisors, whose sum is σ = 81073331358. Its totient is φ = 81073331356.

The previous prime is 81073331299. The next prime is 81073331411. The reversal of 81073331357 is 75313337018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74416566436 + 6656764921 = 272794^2 + 81589^2 .

It is a cyclic number.

It is not a de Polignac number, because 81073331357 - 2⁶ = 81073331293 is a prime.

It is a super-2 number, since 2×81073331357² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81073331257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40536665678 + 40536665679.

It is an arithmetic number, because the mean of its divisors is an integer number (40536665679).

Almost surely, 2^81073331357 is an apocalyptic number.

It is an amenable number.

81073331357 is a deficient number, since it is larger than the sum of its proper divisors (1).

81073331357 is an equidigital number, since it uses as much as digits as its factorization.

81073331357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 81073331357 in words is "eighty-one billion, seventy-three million, three hundred thirty-one thousand, three hundred fifty-seven".