1065985815 has 32 divisors (see below), whose sum is σ = 1726603776. Its totient is φ = 561545600.

The previous prime is 1065985771. The next prime is 1065985909. The reversal of 1065985815 is 5185895601.

It is not a de Polignac number, because 1065985815 - 2⁶ = 1065985751 is a prime.

It is a super-2 number, since 2×1065985815² = 2272651515562428450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1125172 + ... + 1126118.

It is an arithmetic number, because the mean of its divisors is an integer number (53956368).

Almost surely, 2^1065985815 is an apocalyptic number.

1065985815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1065985815 is a deficient number, since it is larger than the sum of its proper divisors (660617961).

1065985815 is a wasteful number, since it uses less digits than its factorization.

1065985815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799.

The product of its (nonzero) digits is 432000, while the sum is 48.

The square root of 1065985815 is about 32649.4382034362. The cubic root of 1065985815 is about 1021.5284706485.

The spelling of 1065985815 in words is "one billion, sixty-five million, nine hundred eighty-five thousand, eight hundred fifteen".