1620345455 has 4 divisors (see below), whose sum is σ = 1944414552. Its totient is φ = 1296276360.

The previous prime is 1620345439. The next prime is 1620345547. The reversal of 1620345455 is 5545430261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1620345455 - 2⁴ = 1620345439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 162034541 + ... + 162034550.

It is an arithmetic number, because the mean of its divisors is an integer number (486103638).

Almost surely, 2^1620345455 is an apocalyptic number.

1620345455 is a deficient number, since it is larger than the sum of its proper divisors (324069097).

1620345455 is an equidigital number, since it uses as much as digits as its factorization.

1620345455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324069096.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 1620345455 is about 40253.5148154792. The cubic root of 1620345455 is about 1174.5437685532.

The spelling of 1620345455 in words is "one billion, six hundred twenty million, three hundred forty-five thousand, four hundred fifty-five".