266696694384201 has 45 divisors (see below), whose sum is σ = 416478846943159. Its totient is φ = 170065301616144.

The previous prime is 266696694384199. The next prime is 266696694384251. The reversal of 266696694384201 is 102483496696662.

The square root of 266696694384201 is 16330851.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 103406018765625 + 163290675618576 = 10168875^2 + 12778524^2 .

It is not a de Polignac number, because 266696694384201 - 2¹ = 266696694384199 is a prime.

It is a super-2 number, since 2×266696694384201² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266696694384201.

It is not an unprimeable number, because it can be changed into a prime (266696694384251) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3380446711 + ... + 3380525603.

Almost surely, 2^{266696694384201} is an apocalyptic number.

266696694384201 is the 16330851-st square number.

266696694384201 is the 8165426-th centered octagonal number.

It is an amenable number.

266696694384201 is a deficient number, since it is larger than the sum of its proper divisors (149782152558958).

266696694384201 is an frugal number, since it uses more digits than its factorization.

266696694384201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157844 (or 78919 counting only the distinct ones).

The product of its (nonzero) digits is 967458816, while the sum is 72.

The spelling of 266696694384201 in words is "two hundred sixty-six trillion, six hundred ninety-six billion, six hundred ninety-four million, three hundred eighty-four thousand, two hundred one".