2782201661 has 2 divisors, whose sum is σ = 2782201662. Its totient is φ = 2782201660.

The previous prime is 2782201637. The next prime is 2782201679. The reversal of 2782201661 is 1661022872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2388179161 + 394022500 = 48869^2 + 19850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2782201661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2782201061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391100830 + 1391100831.

It is an arithmetic number, because the mean of its divisors is an integer number (1391100831).

Almost surely, 2^2782201661 is an apocalyptic number.

It is an amenable number.

2782201661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782201661 is an equidigital number, since it uses as much as digits as its factorization.

2782201661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 2782201661 is about 52746.5796142271. The cubic root of 2782201661 is about 1406.4669625513.

The spelling of 2782201661 in words is "two billion, seven hundred eighty-two million, two hundred one thousand, six hundred sixty-one".