1266265001 has 2 divisors, whose sum is σ = 1266265002. Its totient is φ = 1266265000.

The previous prime is 1266264973. The next prime is 1266265003. The reversal of 1266265001 is 1005626621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702250000 + 564015001 = 26500^2 + 23749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266265001 is a prime.

Together with 1266265003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1266265003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633132500 + 633132501.

It is an arithmetic number, because the mean of its divisors is an integer number (633132501).

Almost surely, 2^1266265001 is an apocalyptic number.

It is an amenable number.

1266265001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266265001 is an equidigital number, since it uses as much as digits as its factorization.

1266265001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1266265001 is about 35584.6174772190. The cubic root of 1266265001 is about 1081.8694761253.

The spelling of 1266265001 in words is "one billion, two hundred sixty-six million, two hundred sixty-five thousand, one".