81469138713840 has 160 divisors (see below), whose sum is σ = 287141874243840. Its totient is φ = 21219868664064.

The previous prime is 81469138713827. The next prime is 81469138713841. The reversal of 81469138713840 is 4831783196418.

81469138713840 is a `hidden beast` number, since 8 + 1 + 469 + 1 + 3 + 87 + 13 + 84 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81469138713841) 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 31 ways as a sum of consecutive naturals, for example, 438479142 + ... + 438664901.

It is an arithmetic number, because the mean of its divisors is an integer number (1794636714024).

Almost surely, 2^{81469138713840} is an apocalyptic number.

81469138713840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81469138713840 is an abundant number, since it is smaller than the sum of its proper divisors (205672735530000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81469138713840 is a wasteful number, since it uses less digits than its factorization.

81469138713840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877144108 (or 877144096 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 81469138713840 in words is "eighty-one trillion, four hundred sixty-nine billion, one hundred thirty-eight million, seven hundred thirteen thousand, eight hundred forty".