81227004275 has 24 divisors (see below), whose sum is σ = 107051925024. Its totient is φ = 60926528000.

The previous prime is 81227004269. The next prime is 81227004277. The reversal of 81227004275 is 57240072218.

It is not a de Polignac number, because 81227004275 - 2¹⁸ = 81226742131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81227004277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251576 + ... + 475125.

It is an arithmetic number, because the mean of its divisors is an integer number (4460496876).

Almost surely, 2^81227004275 is an apocalyptic number.

81227004275 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81227004275 is a deficient number, since it is larger than the sum of its proper divisors (25824920749).

81227004275 is a wasteful number, since it uses less digits than its factorization.

81227004275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726991 (or 726986 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The spelling of 81227004275 in words is "eighty-one billion, two hundred twenty-seven million, four thousand, two hundred seventy-five".