1266640117 has 2 divisors, whose sum is σ = 1266640118. Its totient is φ = 1266640116.

The previous prime is 1266640103. The next prime is 1266640127. The reversal of 1266640117 is 7110466621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707506801 + 559133316 = 26599^2 + 23646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266640117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266640127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633320058 + 633320059.

It is an arithmetic number, because the mean of its divisors is an integer number (633320059).

Almost surely, 2^1266640117 is an apocalyptic number.

It is an amenable number.

1266640117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266640117 is an equidigital number, since it uses as much as digits as its factorization.

1266640117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1266640117 is about 35589.8878475333. The cubic root of 1266640117 is about 1081.9762959149.

The spelling of 1266640117 in words is "one billion, two hundred sixty-six million, six hundred forty thousand, one hundred seventeen".