1266666651 has 12 divisors (see below), whose sum is σ = 1937255112. Its totient is φ = 794771136.

The previous prime is 1266666629. The next prime is 1266666659. The reversal of 1266666651 is 1566666621.

It is not a de Polignac number, because 1266666651 - 2⁵ = 1266666619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266666597 and 1266666606.

It is not an unprimeable number, because it can be changed into a prime (1266666659) 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, 4139281 + ... + 4139586.

It is an arithmetic number, because the mean of its divisors is an integer number (161437926).

Almost surely, 2^1266666651 is an apocalyptic number.

1266666651 is a deficient number, since it is larger than the sum of its proper divisors (670588461).

1266666651 is a wasteful number, since it uses less digits than its factorization.

1266666651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8278890 (or 8278887 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1266666651 is about 35590.2606200067. The cubic root of 1266666651 is about 1081.9838510624.

The spelling of 1266666651 in words is "one billion, two hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-one".