266720957 has 2 divisors, whose sum is σ = 266720958. Its totient is φ = 266720956.

The previous prime is 266720953. The next prime is 266720969. The reversal of 266720957 is 759027662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252778201 + 13942756 = 15899^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 266720957 - 2² = 266720953 is a prime.

It is a super-2 number, since 2×266720957² = 142280137805991698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266720953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133360478 + 133360479.

It is an arithmetic number, because the mean of its divisors is an integer number (133360479).

Almost surely, 2^266720957 is an apocalyptic number.

It is an amenable number.

266720957 is a deficient number, since it is larger than the sum of its proper divisors (1).

266720957 is an equidigital number, since it uses as much as digits as its factorization.

266720957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 266720957 is about 16331.5938291399. The cubic root of 266720957 is about 643.7032673902.

The spelling of 266720957 in words is "two hundred sixty-six million, seven hundred twenty thousand, nine hundred fifty-seven".