3877776391665 has 16 divisors (see below), whose sum is σ = 6768482429376. Its totient is φ = 1880134008000.

The previous prime is 3877776391649. The next prime is 3877776391679. The reversal of 3877776391665 is 5661936777783.

It is not a de Polignac number, because 3877776391665 - 2⁴ = 3877776391649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11750837386 + ... + 11750837715.

It is an arithmetic number, because the mean of its divisors is an integer number (423030151836).

Almost surely, 2^{3877776391665} is an apocalyptic number.

It is an amenable number.

3877776391665 is a deficient number, since it is larger than the sum of its proper divisors (2890706037711).

3877776391665 is a wasteful number, since it uses less digits than its factorization.

3877776391665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23501675120.

The product of its digits is 1680315840, while the sum is 75.

The spelling of 3877776391665 in words is "three trillion, eight hundred seventy-seven billion, seven hundred seventy-six million, three hundred ninety-one thousand, six hundred sixty-five".