1285666899 has 16 divisors (see below), whose sum is σ = 1870694784. Its totient is φ = 778928000.

The previous prime is 1285666883. The next prime is 1285666957. The reversal of 1285666899 is 9986665821.

It is a cyclic number.

It is not a de Polignac number, because 1285666899 - 2⁴ = 1285666883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285666399) 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, 142507 + ... + 151259.

It is an arithmetic number, because the mean of its divisors is an integer number (116918424).

Almost surely, 2^1285666899 is an apocalyptic number.

1285666899 is a deficient number, since it is larger than the sum of its proper divisors (585027885).

1285666899 is a wasteful number, since it uses less digits than its factorization.

1285666899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13218.

The product of its digits is 11197440, while the sum is 60.

The square root of 1285666899 is about 35856.1974977827. The cubic root of 1285666899 is about 1087.3670138876.

The spelling of 1285666899 in words is "one billion, two hundred eighty-five million, six hundred sixty-six thousand, eight hundred ninety-nine".