3771981765 has 12 divisors (see below), whose sum is σ = 6538101804. Its totient is φ = 2011723584.

The previous prime is 3771981749. The next prime is 3771981793. The reversal of 3771981765 is 5671891773.

3771981765 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 2 ways, for example, as 600152004 + 3171829761 = 24498^2 + 56319^2 .

It is not a de Polignac number, because 3771981765 - 2⁴ = 3771981749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41910864 + ... + 41910953.

It is an arithmetic number, because the mean of its divisors is an integer number (544841817).

Almost surely, 2^3771981765 is an apocalyptic number.

It is an amenable number.

3771981765 is a deficient number, since it is larger than the sum of its proper divisors (2766120039).

3771981765 is a wasteful number, since it uses less digits than its factorization.

3771981765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83821828 (or 83821825 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 3771981765 is about 61416.4616776317. The cubic root of 3771981765 is about 1556.6460053830.

The spelling of 3771981765 in words is "three billion, seven hundred seventy-one million, nine hundred eighty-one thousand, seven hundred sixty-five".