3820556565 has 96 divisors (see below), whose sum is σ = 8190314496. Its totient is φ = 1670518080.

The previous prime is 3820556561. The next prime is 3820556609. The reversal of 3820556565 is 5656550283.

3820556565 is a `hidden beast` number, since 3 + 8 + 20 + 5 + 565 + 65 = 666.

It is not a de Polignac number, because 3820556565 - 2² = 3820556561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3820556565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820556561) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 185850 + ... + 205380.

It is an arithmetic number, because the mean of its divisors is an integer number (85315776).

Almost surely, 2^3820556565 is an apocalyptic number.

3820556565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3820556565 is an abundant number, since it is smaller than the sum of its proper divisors (4369757931).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3820556565 is a wasteful number, since it uses less digits than its factorization.

3820556565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19581 (or 19569 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The square root of 3820556565 is about 61810.6509025750. The cubic root of 3820556565 is about 1563.2995804344.

The spelling of 3820556565 in words is "three billion, eight hundred twenty million, five hundred fifty-six thousand, five hundred sixty-five".