1285807666 has 32 divisors (see below), whose sum is σ = 2308678848. Its totient is φ = 529314240.

The previous prime is 1285807637. The next prime is 1285807667. The reversal of 1285807666 is 6667085821.

It is not an unprimeable number, because it can be changed into a prime (1285807667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27256 + ... + 57571.

It is an arithmetic number, because the mean of its divisors is an integer number (72146214).

Almost surely, 2^1285807666 is an apocalyptic number.

1285807666 is a deficient number, since it is larger than the sum of its proper divisors (1022871182).

1285807666 is a wasteful number, since it uses less digits than its factorization.

1285807666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84906.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 1285807666 is about 35858.1603822617. The cubic root of 1285807666 is about 1087.4066975222.

The spelling of 1285807666 in words is "one billion, two hundred eighty-five million, eight hundred seven thousand, six hundred sixty-six".