3835845662221 has 4 divisors (see below), whose sum is σ = 3908220108732. Its totient is φ = 3763471215712.

The previous prime is 3835845662213. The next prime is 3835845662237. The reversal of 3835845662221 is 1222665485383.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2888347836196 + 947497826025 = 1699514^2 + 973395^2 .

It is a cyclic number.

It is not a de Polignac number, because 3835845662221 - 2³ = 3835845662213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3835845666221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36187223176 + ... + 36187223281.

It is an arithmetic number, because the mean of its divisors is an integer number (977055027183).

Almost surely, 2^{3835845662221} is an apocalyptic number.

It is an amenable number.

3835845662221 is a deficient number, since it is larger than the sum of its proper divisors (72374446511).

3835845662221 is an equidigital number, since it uses as much as digits as its factorization.

3835845662221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72374446510.

The product of its digits is 16588800, while the sum is 55.

The spelling of 3835845662221 in words is "three trillion, eight hundred thirty-five billion, eight hundred forty-five million, six hundred sixty-two thousand, two hundred twenty-one".