81384377345 has 16 divisors (see below), whose sum is σ = 100944933888. Its totient is φ = 62923936320.

The previous prime is 81384377341. The next prime is 81384377351. The reversal of 81384377345 is 54377348318.

It is not a de Polignac number, because 81384377345 - 2² = 81384377341 is a prime.

It is a super-4 number, since 4×81384377345⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 229469 + ... + 464138.

It is an arithmetic number, because the mean of its divisors is an integer number (6309058368).

Almost surely, 2^81384377345 is an apocalyptic number.

It is an amenable number.

81384377345 is a deficient number, since it is larger than the sum of its proper divisors (19560556543).

81384377345 is a wasteful number, since it uses less digits than its factorization.

81384377345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694400.

The product of its digits is 6773760, while the sum is 53.

The spelling of 81384377345 in words is "eighty-one billion, three hundred eighty-four million, three hundred seventy-seven thousand, three hundred forty-five".