1620850065 has 16 divisors (see below), whose sum is σ = 2637316800. Its totient is φ = 849801152.

The previous prime is 1620850051. The next prime is 1620850067. The reversal of 1620850065 is 5600580261.

It is a cyclic number.

It is not a de Polignac number, because 1620850065 - 2⁶ = 1620850001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620850067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914850 + ... + 916619.

It is an arithmetic number, because the mean of its divisors is an integer number (164832300).

Almost surely, 2^1620850065 is an apocalyptic number.

1620850065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620850065 is a deficient number, since it is larger than the sum of its proper divisors (1016466735).

1620850065 is a wasteful number, since it uses less digits than its factorization.

1620850065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831536.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 1620850065 is about 40259.7822274289. The cubic root of 1620850065 is about 1174.6656818598.

The spelling of 1620850065 in words is "one billion, six hundred twenty million, eight hundred fifty thousand, sixty-five".