1620650563 has 8 divisors (see below), whose sum is σ = 1852439040. Its totient is φ = 1388928840.

The previous prime is 1620650561. The next prime is 1620650567. The reversal of 1620650563 is 3650560261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620650563 - 2¹ = 1620650561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620650561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57108 + ... + 80638.

It is an arithmetic number, because the mean of its divisors is an integer number (231554880).

Almost surely, 2^1620650563 is an apocalyptic number.

1620650563 is a deficient number, since it is larger than the sum of its proper divisors (231788477).

1620650563 is an equidigital number, since it uses as much as digits as its factorization.

1620650563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33377.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1620650563 is about 40257.3044676367. The cubic root of 1620650563 is about 1174.6174853869.

The spelling of 1620650563 in words is "one billion, six hundred twenty million, six hundred fifty thousand, five hundred sixty-three".