1000665257 has 2 divisors, whose sum is σ = 1000665258. Its totient is φ = 1000665256.

The previous prime is 1000665247. The next prime is 1000665269. The reversal of 1000665257 is 7525660001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978188176 + 22477081 = 31276^2 + 4741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000665257 - 2⁴ = 1000665241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000665247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500332628 + 500332629.

It is an arithmetic number, because the mean of its divisors is an integer number (500332629).

Almost surely, 2^1000665257 is an apocalyptic number.

It is an amenable number.

1000665257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000665257 is an equidigital number, since it uses as much as digits as its factorization.

1000665257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1000665257 is about 31633.2934896131. The cubic root of 1000665257 is about 1000.2217031774.

The spelling of 1000665257 in words is "one billion, six hundred sixty-five thousand, two hundred fifty-seven".