3781955565 has 48 divisors (see below), whose sum is σ = 6720075648. Its totient is φ = 1966543488.

The previous prime is 3781955561. The next prime is 3781955581. The reversal of 3781955565 is 5655591873.

3781955565 is a `hidden beast` number, since 3 + 7 + 81 + 9 + 5 + 556 + 5 = 666.

It is not a de Polignac number, because 3781955565 - 2² = 3781955561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781955561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1308552 + ... + 1311438.

It is an arithmetic number, because the mean of its divisors is an integer number (140001576).

Almost surely, 2^3781955565 is an apocalyptic number.

It is an amenable number.

3781955565 is a deficient number, since it is larger than the sum of its proper divisors (2938120083).

3781955565 is a wasteful number, since it uses less digits than its factorization.

3781955565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618 (or 3615 counting only the distinct ones).

The product of its digits is 5670000, while the sum is 54.

The square root of 3781955565 is about 61497.6061729235. The cubic root of 3781955565 is about 1558.0168154534.

The spelling of 3781955565 in words is "three billion, seven hundred eighty-one million, nine hundred fifty-five thousand, five hundred sixty-five".