3775071661 has 4 divisors (see below), whose sum is σ = 3775694524. Its totient is φ = 3774448800.

The previous prime is 3775071623. The next prime is 3775071709. The reversal of 3775071661 is 1661705773.

3775071661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 873202500 + 2901869161 = 29550^2 + 53869^2 .

It is a cyclic number.

It is not a de Polignac number, because 3775071661 - 2⁷ = 3775071533 is a prime.

It is a super-3 number, since 3×3775071661³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3775071611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302250 + ... + 314491.

It is an arithmetic number, because the mean of its divisors is an integer number (943923631).

Almost surely, 2^3775071661 is an apocalyptic number.

It is an amenable number.

3775071661 is a deficient number, since it is larger than the sum of its proper divisors (622863).

3775071661 is an equidigital number, since it uses as much as digits as its factorization.

3775071661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622862.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 3775071661 is about 61441.6118034024. The cubic root of 3775071661 is about 1557.0709421751.

The spelling of 3775071661 in words is "three billion, seven hundred seventy-five million, seventy-one thousand, six hundred sixty-one".