3777776665 has 32 divisors (see below), whose sum is σ = 5055988896. Its totient is φ = 2692085760.

The previous prime is 3777776663. The next prime is 3777776677. The reversal of 3777776665 is 5666777773.

3777776665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 2110116096 + 1667660569 = 45936^2 + 40837^2 .

It is not a de Polignac number, because 3777776665 - 2¹ = 3777776663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3777776663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201157 + ... + 219133.

It is an arithmetic number, because the mean of its divisors is an integer number (157999653).

Almost surely, 2^3777776665 is an apocalyptic number.

It is an amenable number.

3777776665 is a deficient number, since it is larger than the sum of its proper divisors (1278212231).

3777776665 is a wasteful number, since it uses less digits than its factorization.

3777776665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109.

The product of its digits is 54454680, while the sum is 61.

The square root of 3777776665 is about 61463.6206629580. The cubic root of 3777776665 is about 1557.4427565322.

The spelling of 3777776665 in words is "three billion, seven hundred seventy-seven million, seven hundred seventy-six thousand, six hundred sixty-five".