1266645047 has 2 divisors, whose sum is σ = 1266645048. Its totient is φ = 1266645046.

The previous prime is 1266645031. The next prime is 1266645077. The reversal of 1266645047 is 7405466621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266645047 - 2⁴ = 1266645031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266644995 and 1266645013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266645007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633322523 + 633322524.

It is an arithmetic number, because the mean of its divisors is an integer number (633322524).

Almost surely, 2^1266645047 is an apocalyptic number.

1266645047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266645047 is an equidigital number, since it uses as much as digits as its factorization.

1266645047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 1266645047 is about 35589.9571087126. The cubic root of 1266645047 is about 1081.9776996644.

The spelling of 1266645047 in words is "one billion, two hundred sixty-six million, six hundred forty-five thousand, forty-seven".