3871457816461 has 8 divisors (see below), whose sum is σ = 4109516053560. Its totient is φ = 3634546848768.

The previous prime is 3871457816449. The next prime is 3871457816507. The reversal of 3871457816461 is 1646187541783.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 732958576900 + 3138499239561 = 856130^2 + 1771581^2 .

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 3871457816461 - 2¹⁹ = 3871457292173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3871457816461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871457816431) 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 7 ways as a sum of consecutive naturals, for example, 286810396 + ... + 286823893.

It is an arithmetic number, because the mean of its divisors is an integer number (513689506695).

Almost surely, 2^{3871457816461} is an apocalyptic number.

It is an amenable number.

3871457816461 is a deficient number, since it is larger than the sum of its proper divisors (238058237099).

3871457816461 is a wasteful number, since it uses less digits than its factorization.

3871457816461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573634703.

The product of its digits is 27095040, while the sum is 61.

The spelling of 3871457816461 in words is "three trillion, eight hundred seventy-one billion, four hundred fifty-seven million, eight hundred sixteen thousand, four hundred sixty-one".