81064555001271 has 32 divisors (see below), whose sum is σ = 120125345034240. Its totient is φ = 54029669868000.

The previous prime is 81064555001251. The next prime is 81064555001279. The reversal of 81064555001271 is 17210055546018.

81064555001271 is a `hidden beast` number, since 8 + 1 + 0 + 64 + 5 + 5 + 500 + 12 + 71 = 666.

It is not a de Polignac number, because 81064555001271 - 2¹⁵ = 81064554968503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064555001279) 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, 3209066781 + ... + 3209092041.

It is an arithmetic number, because the mean of its divisors is an integer number (3753917032320).

Almost surely, 2^{81064555001271} is an apocalyptic number.

81064555001271 is a deficient number, since it is larger than the sum of its proper divisors (39060790032969).

81064555001271 is a wasteful number, since it uses less digits than its factorization.

81064555001271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49964 (or 49958 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 45.

The spelling of 81064555001271 in words is "eighty-one trillion, sixty-four billion, five hundred fifty-five million, one thousand, two hundred seventy-one".