81738202327 has 2 divisors, whose sum is σ = 81738202328. Its totient is φ = 81738202326.

The previous prime is 81738202321. The next prime is 81738202421. The reversal of 81738202327 is 72320283718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81738202327 - 2³¹ = 79590718679 is a prime.

It is a super-2 number, since 2×81738202327² (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 (81738202321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40869101163 + 40869101164.

It is an arithmetic number, because the mean of its divisors is an integer number (40869101164).

Almost surely, 2^81738202327 is an apocalyptic number.

81738202327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81738202327 is an equidigital number, since it uses as much as digits as its factorization.

81738202327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 81738202327 in words is "eighty-one billion, seven hundred thirty-eight million, two hundred two thousand, three hundred twenty-seven".