266400961 has 2 divisors, whose sum is σ = 266400962. Its totient is φ = 266400960.

The previous prime is 266400947. The next prime is 266400971. The reversal of 266400961 is 169004662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222576561 + 43824400 = 14919^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 266400961 - 2¹³ = 266392769 is a prime.

It is not a weakly prime, because it can be changed into another prime (266400971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133200480 + 133200481.

It is an arithmetic number, because the mean of its divisors is an integer number (133200481).

Almost surely, 2^266400961 is an apocalyptic number.

It is an amenable number.

266400961 is a deficient number, since it is larger than the sum of its proper divisors (1).

266400961 is an equidigital number, since it uses as much as digits as its factorization.

266400961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 266400961 is about 16321.7940496748. The cubic root of 266400961 is about 643.4457386941.

The spelling of 266400961 in words is "two hundred sixty-six million, four hundred thousand, nine hundred sixty-one".