8342781378761 has 4 divisors (see below), whose sum is σ = 8630463495300. Its totient is φ = 8055099262224.

The previous prime is 8342781378739. The next prime is 8342781378781. The reversal of 8342781378761 is 1678731872438.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1931352252361 + 6411429126400 = 1389731^2 + 2532080^2 .

It is a cyclic number.

It is not a de Polignac number, because 8342781378761 - 2⁶ = 8342781378697 is a prime.

It is a super-2 number, since 2×8342781378761² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8342781378731) 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 3 ways as a sum of consecutive naturals, for example, 143841058226 + ... + 143841058283.

It is an arithmetic number, because the mean of its divisors is an integer number (2157615873825).

Almost surely, 2^{8342781378761} is an apocalyptic number.

It is an amenable number.

8342781378761 is a deficient number, since it is larger than the sum of its proper divisors (287682116539).

8342781378761 is a wasteful number, since it uses less digits than its factorization.

8342781378761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287682116538.

The product of its digits is 75866112, while the sum is 65.

The spelling of 8342781378761 in words is "eight trillion, three hundred forty-two billion, seven hundred eighty-one million, three hundred seventy-eight thousand, seven hundred sixty-one".