81677077627 has 2 divisors, whose sum is σ = 81677077628. Its totient is φ = 81677077626.

The previous prime is 81677077543. The next prime is 81677077631. The reversal of 81677077627 is 72677077618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81677077627 - 2²⁷ = 81542859899 is a prime.

It is a super-2 number, since 2×81677077627² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81677072627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838538813 + 40838538814.

It is an arithmetic number, because the mean of its divisors is an integer number (40838538814).

Almost surely, 2^81677077627 is an apocalyptic number.

81677077627 is a deficient number, since it is larger than the sum of its proper divisors (1).

81677077627 is an equidigital number, since it uses as much as digits as its factorization.

81677077627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9680832, while the sum is 58.

Subtracting from 81677077627 its reverse (72677077618), we obtain a palindrome (9000000009).

The spelling of 81677077627 in words is "eighty-one billion, six hundred seventy-seven million, seventy-seven thousand, six hundred twenty-seven".