7840413541685 has 16 divisors (see below), whose sum is σ = 9496963309680. Its totient is φ = 6213378862080.

The previous prime is 7840413541661. The next prime is 7840413541687. The reversal of 7840413541685 is 5861453140487.

It can be written as a sum of positive squares in 8 ways, for example, as 19704859876 + 7820708681809 = 140374^2 + 2796553^2 .

It is not a de Polignac number, because 7840413541685 - 2¹² = 7840413537589 is a prime.

It is a super-2 number, since 2×7840413541685² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7840413541685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840413541687) 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, 782429 + ... + 4036461.

It is an arithmetic number, because the mean of its divisors is an integer number (593560206855).

Almost surely, 2^{7840413541685} is an apocalyptic number.

It is an amenable number.

7840413541685 is a deficient number, since it is larger than the sum of its proper divisors (1656549767995).

7840413541685 is a wasteful number, since it uses less digits than its factorization.

7840413541685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258568.

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 7840413541685 in words is "seven trillion, eight hundred forty billion, four hundred thirteen million, five hundred forty-one thousand, six hundred eighty-five".