6865536400391 has 4 divisors (see below), whose sum is σ = 6865543622784. Its totient is φ = 6865529178000.

The previous prime is 6865536400357. The next prime is 6865536400423. The reversal of 6865536400391 is 1930046355686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6865536400391 - 2¹⁰ = 6865536399367 is a prime.

It is a super-3 number, since 3×6865536400391³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6865536400351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1921895 + ... + 4174296.

It is an arithmetic number, because the mean of its divisors is an integer number (1716385905696).

Almost surely, 2^{6865536400391} is an apocalyptic number.

6865536400391 is a deficient number, since it is larger than the sum of its proper divisors (7222393).

6865536400391 is a wasteful number, since it uses less digits than its factorization.

6865536400391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7222392.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 6865536400391 in words is "six trillion, eight hundred sixty-five billion, five hundred thirty-six million, four hundred thousand, three hundred ninety-one".