81042253461427 has 2 divisors, whose sum is σ = 81042253461428. Its totient is φ = 81042253461426.

The previous prime is 81042253461341. The next prime is 81042253461457. The reversal of 81042253461427 is 72416435224018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81042253461427 is a prime.

It is a super-2 number, since 2×81042253461427² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81042253461457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40521126730713 + 40521126730714.

It is an arithmetic number, because the mean of its divisors is an integer number (40521126730714).

Almost surely, 2^{81042253461427} is an apocalyptic number.

81042253461427 is a deficient number, since it is larger than the sum of its proper divisors (1).

81042253461427 is an equidigital number, since it uses as much as digits as its factorization.

81042253461427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 49.

It can be divided in two parts, 810422534 and 61427, that added together give a square (810483961 = 28469²).

The spelling of 81042253461427 in words is "eighty-one trillion, forty-two billion, two hundred fifty-three million, four hundred sixty-one thousand, four hundred twenty-seven".