81266551627 has 2 divisors, whose sum is σ = 81266551628. Its totient is φ = 81266551626.

The previous prime is 81266551577. The next prime is 81266551657. The reversal of 81266551627 is 72615566218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81266551627 - 2¹⁵ = 81266518859 is a prime.

It is not a weakly prime, because it can be changed into another prime (81266551657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40633275813 + 40633275814.

It is an arithmetic number, because the mean of its divisors is an integer number (40633275814).

Almost surely, 2^81266551627 is an apocalyptic number.

81266551627 is a deficient number, since it is larger than the sum of its proper divisors (1).

81266551627 is an equidigital number, since it uses as much as digits as its factorization.

81266551627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 49.

The spelling of 81266551627 in words is "eighty-one billion, two hundred sixty-six million, five hundred fifty-one thousand, six hundred twenty-seven".