1620165065 has 16 divisors (see below), whose sum is σ = 2000052480. Its totient is φ = 1259012160.

The previous prime is 1620165049. The next prime is 1620165119. The reversal of 1620165065 is 5605610261.

It is not a de Polignac number, because 1620165065 - 2⁴ = 1620165049 is a prime.

It is a Curzon 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, 109796 + ... + 123674.

It is an arithmetic number, because the mean of its divisors is an integer number (125003280).

Almost surely, 2^1620165065 is an apocalyptic number.

It is an amenable number.

1620165065 is a deficient number, since it is larger than the sum of its proper divisors (379887415).

1620165065 is a wasteful number, since it uses less digits than its factorization.

1620165065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14552.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1620165065 is about 40251.2740792139. The cubic root of 1620165065 is about 1174.5001803556.

The spelling of 1620165065 in words is "one billion, six hundred twenty million, one hundred sixty-five thousand, sixty-five".