4321072661 has 2 divisors, whose sum is σ = 4321072662. Its totient is φ = 4321072660.

The previous prime is 4321072643. The next prime is 4321072687. The reversal of 4321072661 is 1662701234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3795792100 + 525280561 = 61610^2 + 22919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4321072661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4321072601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2160536330 + 2160536331.

It is an arithmetic number, because the mean of its divisors is an integer number (2160536331).

Almost surely, 2^4321072661 is an apocalyptic number.

It is an amenable number.

4321072661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4321072661 is an equidigital number, since it uses as much as digits as its factorization.

4321072661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 4321072661 is about 65734.8664028459. The cubic root of 4321072661 is about 1628.7853574088.

Adding to 4321072661 its reverse (1662701234), we get a palindrome (5983773895).

The spelling of 4321072661 in words is "four billion, three hundred twenty-one million, seventy-two thousand, six hundred sixty-one".