81052211457 has 12 divisors (see below), whose sum is σ = 133800476160. Its totient is φ = 46315549368.

The previous prime is 81052211441. The next prime is 81052211503. The reversal of 81052211457 is 75411225018.

It is a happy number.

81052211457 is a `hidden beast` number, since 8 + 10 + 522 + 114 + 5 + 7 = 666.

It is not a de Polignac number, because 81052211457 - 2⁴ = 81052211441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81052212457) 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 in 11 ways as a sum of consecutive naturals, for example, 643271457 + ... + 643271582.

It is an arithmetic number, because the mean of its divisors is an integer number (11150039680).

Almost surely, 2^81052211457 is an apocalyptic number.

It is an amenable number.

81052211457 is a deficient number, since it is larger than the sum of its proper divisors (52748264703).

81052211457 is a wasteful number, since it uses less digits than its factorization.

81052211457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286543052 (or 1286543049 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 81052211457 in words is "eighty-one billion, fifty-two million, two hundred eleven thousand, four hundred fifty-seven".