81761026227129 has 24 divisors (see below), whose sum is σ = 124321410168800. Its totient is φ = 51635884613760.

The previous prime is 81761026227029. The next prime is 81761026227143. The reversal of 81761026227129 is 92172262016718.

81761026227129 is a `hidden beast` number, since 8 + 1 + 7 + 6 + 1 + 0 + 2 + 622 + 7 + 1 + 2 + 9 = 666.

It is not a de Polignac number, because 81761026227129 - 2⁹ = 81761026226617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81761026227029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8972659 + ... + 15621480.

Almost surely, 2^{81761026227129} is an apocalyptic number.

It is an amenable number.

81761026227129 is a deficient number, since it is larger than the sum of its proper divisors (42560383941671).

81761026227129 is a wasteful number, since it uses less digits than its factorization.

81761026227129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24613605 (or 24613602 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 81761026227129 in words is "eighty-one trillion, seven hundred sixty-one billion, twenty-six million, two hundred twenty-seven thousand, one hundred twenty-nine".