1266258656 has 24 divisors (see below), whose sum is σ = 2684712744. Its totient is φ = 584426880.

The previous prime is 1266258641. The next prime is 1266258671. The reversal of 1266258656 is 6568526621.

It is an interprime number because it is at equal distance from previous prime (1266258641) and next prime (1266258671).

It is a self number, because there is not a number n which added to its sum of digits gives 1266258656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521530 + ... + 1522361.

It is an arithmetic number, because the mean of its divisors is an integer number (111863031).

Almost surely, 2^1266258656 is an apocalyptic number.

1266258656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1266258656 is an abundant number, since it is smaller than the sum of its proper divisors (1418454088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266258656 is a wasteful number, since it uses less digits than its factorization.

1266258656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043914 (or 3043906 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 1266258656 is about 35584.5283234161. The cubic root of 1266258656 is about 1081.8676691119.

The spelling of 1266258656 in words is "one billion, two hundred sixty-six million, two hundred fifty-eight thousand, six hundred fifty-six".