81917425127307 has 32 divisors (see below), whose sum is σ = 143341495787520. Its totient is φ = 40314795685920.

The previous prime is 81917425127267. The next prime is 81917425127309. The reversal of 81917425127307 is 70372152471918.

It is not a de Polignac number, because 81917425127307 - 2⁶ = 81917425127243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (81917425127309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9332124243 + ... + 9332133020.

It is an arithmetic number, because the mean of its divisors is an integer number (4479421743360).

Almost surely, 2^{81917425127307} is an apocalyptic number.

81917425127307 is a deficient number, since it is larger than the sum of its proper divisors (61424070660213).

81917425127307 is a wasteful number, since it uses less digits than its factorization.

81917425127307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18664257303.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 81917425127307 in words is "eighty-one trillion, nine hundred seventeen billion, four hundred twenty-five million, one hundred twenty-seven thousand, three hundred seven".