3788431661 has 4 divisors (see below), whose sum is σ = 4329636192. Its totient is φ = 3247227132.

The previous prime is 3788431639. The next prime is 3788431667. The reversal of 3788431661 is 1661348873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1661348873 = 3121 ⋅532313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3788431661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3788431667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270602255 + ... + 270602268.

It is an arithmetic number, because the mean of its divisors is an integer number (1082409048).

Almost surely, 2^3788431661 is an apocalyptic number.

It is an amenable number.

3788431661 is a deficient number, since it is larger than the sum of its proper divisors (541204531).

3788431661 is an equidigital number, since it uses as much as digits as its factorization.

3788431661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541204530.

The product of its digits is 580608, while the sum is 47.

The square root of 3788431661 is about 61550.2368882525. The cubic root of 3788431661 is about 1558.9056072068.

The spelling of 3788431661 in words is "three billion, seven hundred eighty-eight million, four hundred thirty-one thousand, six hundred sixty-one".