3748389661 has 2 divisors, whose sum is σ = 3748389662. Its totient is φ = 3748389660.

The previous prime is 3748389581. The next prime is 3748389683. The reversal of 3748389661 is 1669838473.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2493104761 + 1255284900 = 49931^2 + 35430^2 .

It is a cyclic number.

It is not a de Polignac number, because 3748389661 - 2¹⁵ = 3748356893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3748381661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1874194830 + 1874194831.

It is an arithmetic number, because the mean of its divisors is an integer number (1874194831).

Almost surely, 2^3748389661 is an apocalyptic number.

It is an amenable number.

3748389661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3748389661 is an equidigital number, since it uses as much as digits as its factorization.

3748389661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 55.

The square root of 3748389661 is about 61224.0937948452. The cubic root of 3748389661 is about 1553.3938345728.

The spelling of 3748389661 in words is "three billion, seven hundred forty-eight million, three hundred eighty-nine thousand, six hundred sixty-one".