266401669 has 2 divisors, whose sum is σ = 266401670. Its totient is φ = 266401668.

The previous prime is 266401651. The next prime is 266401699. The reversal of 266401669 is 966104662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238702500 + 27699169 = 15450^2 + 5263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266401669 is a prime.

It is a super-2 number, since 2×266401669² = 141939698491971122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266401609) 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, 133200834 + 133200835.

It is an arithmetic number, because the mean of its divisors is an integer number (133200835).

Almost surely, 2^266401669 is an apocalyptic number.

It is an amenable number.

266401669 is a deficient number, since it is larger than the sum of its proper divisors (1).

266401669 is an equidigital number, since it uses as much as digits as its factorization.

266401669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 266401669 is about 16321.8157384526. The cubic root of 266401669 is about 643.4463087110.

The spelling of 266401669 in words is "two hundred sixty-six million, four hundred one thousand, six hundred sixty-nine".