1766151066721 has 2 divisors, whose sum is σ = 1766151066722. Its totient is φ = 1766151066720.

The previous prime is 1766151066637. The next prime is 1766151066731. The reversal of 1766151066721 is 1276601516671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 957734292321 + 808416774400 = 978639^2 + 899120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1766151066721 - 2¹⁵ = 1766151033953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1766151066731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 883075533360 + 883075533361.

It is an arithmetic number, because the mean of its divisors is an integer number (883075533361).

Almost surely, 2^{1766151066721} is an apocalyptic number.

It is an amenable number.

1766151066721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1766151066721 is an equidigital number, since it uses as much as digits as its factorization.

1766151066721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 1766151066721 in words is "one trillion, seven hundred sixty-six billion, one hundred fifty-one million, sixty-six thousand, seven hundred twenty-one".