6415780316885 has 4 divisors (see below), whose sum is σ = 7698936380268. Its totient is φ = 5132624253504.

The previous prime is 6415780316867. The next prime is 6415780316929. The reversal of 6415780316885 is 5886130875146.

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 3096945314596 + 3318835002289 = 1759814^2 + 1821767^2 .

It is a cyclic number.

It is not a de Polignac number, because 6415780316885 - 2¹² = 6415780312789 is a prime.

It is a super-2 number, since 2×6415780316885² (a number of 26 digits) contains 22 as substring.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641578031684 + ... + 641578031693.

It is an arithmetic number, because the mean of its divisors is an integer number (1924734095067).

Almost surely, 2^{6415780316885} is an apocalyptic number.

It is an amenable number.

6415780316885 is a deficient number, since it is larger than the sum of its proper divisors (1283156063383).

6415780316885 is a wasteful number, since it uses less digits than its factorization.

6415780316885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283156063382.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 6415780316885 in words is "six trillion, four hundred fifteen billion, seven hundred eighty million, three hundred sixteen thousand, eight hundred eighty-five".