4389751661 has 2 divisors, whose sum is σ = 4389751662. Its totient is φ = 4389751660.

The previous prime is 4389751657. The next prime is 4389751703. The reversal of 4389751661 is 1661579834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3650455561 + 739296100 = 60419^2 + 27190^2 .

It is a cyclic number.

It is not a de Polignac number, because 4389751661 - 2² = 4389751657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4389756661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2194875830 + 2194875831.

It is an arithmetic number, because the mean of its divisors is an integer number (2194875831).

Almost surely, 2^4389751661 is an apocalyptic number.

It is an amenable number.

4389751661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4389751661 is an equidigital number, since it uses as much as digits as its factorization.

4389751661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 4389751661 is about 66255.2010109395. The cubic root of 4389751661 is about 1637.3693276143.

The spelling of 4389751661 in words is "four billion, three hundred eighty-nine million, seven hundred fifty-one thousand, six hundred sixty-one".