3662981750261 has 2 divisors, whose sum is σ = 3662981750262. Its totient is φ = 3662981750260.

The previous prime is 3662981750237. The next prime is 3662981750273. The reversal of 3662981750261 is 1620571892663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2580903297361 + 1082078452900 = 1606519^2 + 1040230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3662981750261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3662981750197 and 3662981750206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3662981750221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1831490875130 + 1831490875131.

It is an arithmetic number, because the mean of its divisors is an integer number (1831490875131).

Almost surely, 2^{3662981750261} is an apocalyptic number.

It is an amenable number.

3662981750261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3662981750261 is an equidigital number, since it uses as much as digits as its factorization.

3662981750261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 3662981750261 in words is "three trillion, six hundred sixty-two billion, nine hundred eighty-one million, seven hundred fifty thousand, two hundred sixty-one".