1266259887 has 12 divisors (see below), whose sum is σ = 1829777040. Its totient is φ = 843834048.

The previous prime is 1266259873. The next prime is 1266259913. The reversal of 1266259887 is 7889526621.

1266259887 is a `hidden beast` number, since 1 + 2 + 6 + 625 + 9 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 1266259887 - 2⁶ = 1266259823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266259847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3483 + ... + 50444.

It is an arithmetic number, because the mean of its divisors is an integer number (152481420).

Almost surely, 2^1266259887 is an apocalyptic number.

1266259887 is a deficient number, since it is larger than the sum of its proper divisors (563517153).

1266259887 is a wasteful number, since it uses less digits than its factorization.

1266259887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56542 (or 56539 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1266259887 is about 35584.5456202549. The cubic root of 1266259887 is about 1081.8680196929.

The spelling of 1266259887 in words is "one billion, two hundred sixty-six million, two hundred fifty-nine thousand, eight hundred eighty-seven".