3945248650225 has 9 divisors (see below), whose sum is σ = 4892120641153. Its totient is φ = 3156190975120.

The previous prime is 3945248650193. The next prime is 3945248650229. The reversal of 3945248650225 is 5220568425493.

The square root of 3945248650225 is 1986265.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2309448577969 + 1635800072256 = 1519687^2 + 1278984^2 .

It is not a de Polignac number, because 3945248650225 - 2⁵ = 3945248650193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3945248650229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9732699 + ... + 10129951.

Almost surely, 2^{3945248650225} is an apocalyptic number.

3945248650225 is the 1986265-th square number.

3945248650225 is the 993133-rd centered octagonal number.

It is an amenable number.

3945248650225 is a deficient number, since it is larger than the sum of its proper divisors (946871990928).

3945248650225 is an frugal number, since it uses more digits than its factorization.

3945248650225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794516 (or 397258 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 55.

The spelling of 3945248650225 in words is "three trillion, nine hundred forty-five billion, two hundred forty-eight million, six hundred fifty thousand, two hundred twenty-five".