3747766721 has 2 divisors, whose sum is σ = 3747766722. Its totient is φ = 3747766720.

The previous prime is 3747766709. The next prime is 3747766769. The reversal of 3747766721 is 1276677473.

3747766721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3384330625 + 363436096 = 58175^2 + 19064^2 .

It is a cyclic number.

It is not a de Polignac number, because 3747766721 - 2¹⁴ = 3747750337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3747766721.

It is not a weakly prime, because it can be changed into another prime (3747766621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1873883360 + 1873883361.

It is an arithmetic number, because the mean of its divisors is an integer number (1873883361).

Almost surely, 2^3747766721 is an apocalyptic number.

It is an amenable number.

3747766721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3747766721 is an equidigital number, since it uses as much as digits as its factorization.

3747766721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2074464, while the sum is 50.

The square root of 3747766721 is about 61219.0062072229. The cubic root of 3747766721 is about 1553.3077776387.

The spelling of 3747766721 in words is "three billion, seven hundred forty-seven million, seven hundred sixty-six thousand, seven hundred twenty-one".