102666257 has 2 divisors, whose sum is σ = 102666258. Its totient is φ = 102666256.

The previous prime is 102666211. The next prime is 102666287. The reversal of 102666257 is 752666201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99221521 + 3444736 = 9961^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 102666257 - 2¹⁴ = 102649873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102666287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51333128 + 51333129.

It is an arithmetic number, because the mean of its divisors is an integer number (51333129).

Almost surely, 2^102666257 is an apocalyptic number.

It is an amenable number.

102666257 is a deficient number, since it is larger than the sum of its proper divisors (1).

102666257 is an equidigital number, since it uses as much as digits as its factorization.

102666257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 102666257 is about 10132.4358867944. The cubic root of 102666257 is about 468.2479768568.

The spelling of 102666257 in words is "one hundred two million, six hundred sixty-six thousand, two hundred fifty-seven".