1620650005 has 64 divisors (see below), whose sum is σ = 2231792640. Its totient is φ = 1128411648.

The previous prime is 1620649999. The next prime is 1620650051. The reversal of 1620650005 is 5000560261.

It is not a de Polignac number, because 1620650005 - 2²¹ = 1618552853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22200649 + ... + 22200721.

It is an arithmetic number, because the mean of its divisors is an integer number (34871760).

Almost surely, 2^1620650005 is an apocalyptic number.

It is an amenable number.

1620650005 is a deficient number, since it is larger than the sum of its proper divisors (611142635).

1620650005 is an equidigital number, since it uses as much as digits as its factorization.

1620650005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1620650005 is about 40257.2975372168. The cubic root of 1620650005 is about 1174.6173505776.

The spelling of 1620650005 in words is "one billion, six hundred twenty million, six hundred fifty thousand, five".