3877666561 has 8 divisors (see below), whose sum is σ = 4132957824. Its totient is φ = 3625396800.

The previous prime is 3877666511. The next prime is 3877666571. The reversal of 3877666561 is 1656667783.

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 3877666561 - 2²¹ = 3875569409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3877666501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752725 + ... + 757858.

It is an arithmetic number, because the mean of its divisors is an integer number (516619728).

Almost surely, 2^3877666561 is an apocalyptic number.

It is an amenable number.

3877666561 is a deficient number, since it is larger than the sum of its proper divisors (255291263).

3877666561 is a wasteful number, since it uses less digits than its factorization.

3877666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510751.

The product of its digits is 7620480, while the sum is 55.

The square root of 3877666561 is about 62270.9126398514. The cubic root of 3877666561 is about 1571.0505310306.

The spelling of 3877666561 in words is "three billion, eight hundred seventy-seven million, six hundred sixty-six thousand, five hundred sixty-one".