3648857786405 has 8 divisors (see below), whose sum is σ = 4715446985592. Its totient is φ = 2694541134528.

The previous prime is 3648857786377. The next prime is 3648857786411. The reversal of 3648857786405 is 5046877588463.

It can be written as a sum of positive squares in 4 ways, for example, as 144477530404 + 3504380256001 = 380102^2 + 1871999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3648857786405 - 2⁶ = 3648857786341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28068136754 + ... + 28068136883.

It is an arithmetic number, because the mean of its divisors is an integer number (589430873199).

Almost surely, 2^{3648857786405} is an apocalyptic number.

It is an amenable number.

3648857786405 is a deficient number, since it is larger than the sum of its proper divisors (1066589199187).

3648857786405 is a wasteful number, since it uses less digits than its factorization.

3648857786405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56136273655.

The product of its (nonzero) digits is 1083801600, while the sum is 71.

The spelling of 3648857786405 in words is "three trillion, six hundred forty-eight billion, eight hundred fifty-seven million, seven hundred eighty-six thousand, four hundred five".