1286780066 has 24 divisors (see below), whose sum is σ = 2284796892. Its totient is φ = 539906400.

The previous prime is 1286780059. The next prime is 1286780071. The reversal of 1286780066 is 6600876821.

It can be written as a sum of positive squares in 2 ways, for example, as 990423841 + 296356225 = 31471^2 + 17215^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1286779999 and 1286780026.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201365 + ... + 207656.

Almost surely, 2^1286780066 is an apocalyptic number.

1286780066 is a deficient number, since it is larger than the sum of its proper divisors (998016826).

1286780066 is a wasteful number, since it uses less digits than its factorization.

1286780066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409058 (or 409047 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1286780066 is about 35871.7167974994. The cubic root of 1286780066 is about 1087.6807477966.

The spelling of 1286780066 in words is "one billion, two hundred eighty-six million, seven hundred eighty thousand, sixty-six".