81384377346 has 16 divisors (see below), whose sum is σ = 180854172000. Its totient is φ = 27128125764.

The previous prime is 81384377341. The next prime is 81384377351. The reversal of 81384377346 is 64377348318.

81384377346 is a `hidden beast` number, since 8 + 138 + 437 + 73 + 4 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (81384377341) and next prime (81384377351).

It is a super-2 number, since 2×81384377346² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1507118099 = 81384377346 / (8 + 1 + 3 + 8 + 4 + 3 + 7 + 7 + 3 + 4 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 81384377292 and 81384377301.

It is not an unprimeable number, because it can be changed into a prime (81384377341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753558996 + ... + 753559103.

It is an arithmetic number, because the mean of its divisors is an integer number (11303385750).

Almost surely, 2^81384377346 is an apocalyptic number.

81384377346 is an abundant number, since it is smaller than the sum of its proper divisors (99469794654).

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

81384377346 is a wasteful number, since it uses less digits than its factorization.

81384377346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507118110 (or 1507118104 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The spelling of 81384377346 in words is "eighty-one billion, three hundred eighty-four million, three hundred seventy-seven thousand, three hundred forty-six".