7865985841540 has 12 divisors (see below), whose sum is σ = 16518570267276. Its totient is φ = 3146394336608.

The previous prime is 7865985841531. The next prime is 7865985841541. The reversal of 7865985841540 is 451485895687.

It can be written as a sum of positive squares in 2 ways, for example, as 5645832201216 + 2220153640324 = 2376096^2 + 1490018^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7865985841540.

It is not an unprimeable number, because it can be changed into a prime (7865985841541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196649646019 + ... + 196649646058.

It is an arithmetic number, because the mean of its divisors is an integer number (1376547522273).

Almost surely, 2^{7865985841540} is an apocalyptic number.

It is an amenable number.

7865985841540 is an abundant number, since it is smaller than the sum of its proper divisors (8652584425736).

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

7865985841540 is a wasteful number, since it uses less digits than its factorization.

7865985841540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393299292086 (or 393299292084 counting only the distinct ones).

The product of its (nonzero) digits is 387072000, while the sum is 70.

The spelling of 7865985841540 in words is "seven trillion, eight hundred sixty-five billion, nine hundred eighty-five million, eight hundred forty-one thousand, five hundred forty".