1065665406 has 32 divisors (see below), whose sum is σ = 2304253728. Its totient is φ = 326615040.

The previous prime is 1065665387. The next prime is 1065665413. The reversal of 1065665406 is 6045665601.

It is a super-2 number, since 2×1065665406² = 2271285515090289672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6535 + ... + 46626.

It is an arithmetic number, because the mean of its divisors is an integer number (72007929).

Almost surely, 2^1065665406 is an apocalyptic number.

1065665406 is an abundant number, since it is smaller than the sum of its proper divisors (1238588322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1065665406 is a wasteful number, since it uses less digits than its factorization.

1065665406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53436.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1065665406 is about 32644.5310274171. The cubic root of 1065665406 is about 1021.4261116521.

The spelling of 1065665406 in words is "one billion, sixty-five million, six hundred sixty-five thousand, four hundred six".