1285665915 has 16 divisors (see below), whose sum is σ = 2057810976. Its totient is φ = 685440000.

The previous prime is 1285665911. The next prime is 1285665917. The reversal of 1285665915 is 5195665821.

1285665915 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1285665915 - 2² = 1285665911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285665911) 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, 31915 + ... + 59915.

It is an arithmetic number, because the mean of its divisors is an integer number (128613186).

Almost surely, 2^1285665915 is an apocalyptic number.

1285665915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1285665915 is a deficient number, since it is larger than the sum of its proper divisors (772145061).

1285665915 is a wasteful number, since it uses less digits than its factorization.

1285665915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31070.

The product of its digits is 648000, while the sum is 48.

The square root of 1285665915 is about 35856.1837763028. The cubic root of 1285665915 is about 1087.3667364779.

The spelling of 1285665915 in words is "one billion, two hundred eighty-five million, six hundred sixty-five thousand, nine hundred fifteen".