3836401661 has 4 divisors (see below), whose sum is σ = 3908786652. Its totient is φ = 3764016672.

The previous prime is 3836401651. The next prime is 3836401703. The reversal of 3836401661 is 1661046383.

It is a happy number.

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 1705194436 + 2131207225 = 41294^2 + 46165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3836401661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3836401651) 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, 36192416 + ... + 36192521.

It is an arithmetic number, because the mean of its divisors is an integer number (977196663).

Almost surely, 2^3836401661 is an apocalyptic number.

It is an amenable number.

3836401661 is a deficient number, since it is larger than the sum of its proper divisors (72384991).

3836401661 is an equidigital number, since it uses as much as digits as its factorization.

3836401661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72384990.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 3836401661 is about 61938.6927614718. The cubic root of 3836401661 is about 1565.4577709339.

The spelling of 3836401661 in words is "three billion, eight hundred thirty-six million, four hundred one thousand, six hundred sixty-one".