1266666015 has 16 divisors (see below), whose sum is σ = 2027482848. Its totient is φ = 675282816.

The previous prime is 1266665993. The next prime is 1266666041. The reversal of 1266666015 is 5106666621.

It is not a de Polignac number, because 1266666015 - 2⁸ = 1266665759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24717 + ... + 56073.

It is an arithmetic number, because the mean of its divisors is an integer number (126717678).

Almost surely, 2^1266666015 is an apocalyptic number.

1266666015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266666015 is a deficient number, since it is larger than the sum of its proper divisors (760816833).

1266666015 is a wasteful number, since it uses less digits than its factorization.

1266666015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34058.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1266666015 is about 35590.2516849769. The cubic root of 1266666015 is about 1081.9836699724.

The spelling of 1266666015 in words is "one billion, two hundred sixty-six million, six hundred sixty-six thousand, fifteen".