266730550721 has 2 divisors, whose sum is σ = 266730550722. Its totient is φ = 266730550720.

The previous prime is 266730550717. The next prime is 266730550729. The reversal of 266730550721 is 127055037662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237277126321 + 29453424400 = 487111^2 + 171620^2 .

It is a cyclic number.

It is not a de Polignac number, because 266730550721 - 2² = 266730550717 is a prime.

It is a super-2 number, since 2×266730550721² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266730550729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133365275360 + 133365275361.

It is an arithmetic number, because the mean of its divisors is an integer number (133365275361).

Almost surely, 2^266730550721 is an apocalyptic number.

It is an amenable number.

266730550721 is a deficient number, since it is larger than the sum of its proper divisors (1).

266730550721 is an equidigital number, since it uses as much as digits as its factorization.

266730550721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 266730550721 in words is "two hundred sixty-six billion, seven hundred thirty million, five hundred fifty thousand, seven hundred twenty-one".