4245285661 has 4 divisors (see below), whose sum is σ = 4253434524. Its totient is φ = 4237136800.

The previous prime is 4245285643. The next prime is 4245285689. The reversal of 4245285661 is 1665825424.

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 3189425625 + 1055860036 = 56475^2 + 32494^2 .

It is a cyclic number.

It is not a de Polignac number, because 4245285661 - 2⁷ = 4245285533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4245285641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4073650 + ... + 4074691.

It is an arithmetic number, because the mean of its divisors is an integer number (1063358631).

Almost surely, 2^4245285661 is an apocalyptic number.

It is an amenable number.

4245285661 is a deficient number, since it is larger than the sum of its proper divisors (8148863).

4245285661 is an equidigital number, since it uses as much as digits as its factorization.

4245285661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8148862.

The product of its digits is 460800, while the sum is 43.

The square root of 4245285661 is about 65155.8566899400. The cubic root of 4245285661 is about 1619.2067524494.

The spelling of 4245285661 in words is "four billion, two hundred forty-five million, two hundred eighty-five thousand, six hundred sixty-one".