266642071 has 2 divisors, whose sum is σ = 266642072. Its totient is φ = 266642070.

The previous prime is 266642021. The next prime is 266642113. The reversal of 266642071 is 170246662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266642071 - 2¹³ = 266633879 is a prime.

It is equal to p_14538463 and since 266642071 and 14538463 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266642021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133321035 + 133321036.

It is an arithmetic number, because the mean of its divisors is an integer number (133321036).

Almost surely, 2^266642071 is an apocalyptic number.

266642071 is a deficient number, since it is larger than the sum of its proper divisors (1).

266642071 is an equidigital number, since it uses as much as digits as its factorization.

266642071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 266642071 is about 16329.1785157735. The cubic root of 266642071 is about 643.6398000828.

The spelling of 266642071 in words is "two hundred sixty-six million, six hundred forty-two thousand, seventy-one".