1266258657 has 16 divisors (see below), whose sum is σ = 1713676608. Its totient is φ = 831536640.

The previous prime is 1266258641. The next prime is 1266258671. The reversal of 1266258657 is 7568526621.

It is a happy number.

It is not a de Polignac number, because 1266258657 - 2⁴ = 1266258641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266258607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189658 + ... + 196220.

It is an arithmetic number, because the mean of its divisors is an integer number (107104788).

Almost surely, 2^1266258657 is an apocalyptic number.

It is an amenable number.

1266258657 is a deficient number, since it is larger than the sum of its proper divisors (447417951).

1266258657 is an equidigital number, since it uses as much as digits as its factorization.

1266258657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520.

The product of its digits is 1209600, while the sum is 48.

The square root of 1266258657 is about 35584.5283374671. The cubic root of 1266258657 is about 1081.8676693967.

The spelling of 1266258657 in words is "one billion, two hundred sixty-six million, two hundred fifty-eight thousand, six hundred fifty-seven".