81434284106845 has 64 divisors (see below), whose sum is σ = 107343138816000. Its totient is φ = 59031859941376.

The previous prime is 81434284106843. The next prime is 81434284106869. The reversal of 81434284106845 is 54860148243418.

It is a cyclic number.

It is not a de Polignac number, because 81434284106845 - 2¹ = 81434284106843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81434284106845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81434284106843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5210452491 + ... + 5210468119.

It is an arithmetic number, because the mean of its divisors is an integer number (1677236544000).

Almost surely, 2^{81434284106845} is an apocalyptic number.

81434284106845 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81434284106845 is a deficient number, since it is larger than the sum of its proper divisors (25908854709155).

81434284106845 is a wasteful number, since it uses less digits than its factorization.

81434284106845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21582.

The product of its (nonzero) digits is 23592960, while the sum is 58.

The spelling of 81434284106845 in words is "eighty-one trillion, four hundred thirty-four billion, two hundred eighty-four million, one hundred six thousand, eight hundred forty-five".