1620684055 has 4 divisors (see below), whose sum is σ = 1944820872. Its totient is φ = 1296547240.

The previous prime is 1620684041. The next prime is 1620684083. The reversal of 1620684055 is 5504860261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5504860261 = 463 ⋅11889547.

It is not a de Polignac number, because 1620684055 - 2¹³ = 1620675863 is a prime.

It is a super-2 number, since 2×1620684055² = 5253233612262486050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162068401 + ... + 162068410.

It is an arithmetic number, because the mean of its divisors is an integer number (486205218).

Almost surely, 2^1620684055 is an apocalyptic number.

1620684055 is a deficient number, since it is larger than the sum of its proper divisors (324136817).

1620684055 is an equidigital number, since it uses as much as digits as its factorization.

1620684055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324136816.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 1620684055 is about 40257.7204396871. The cubic root of 1620684055 is about 1174.6255767914.

The spelling of 1620684055 in words is "one billion, six hundred twenty million, six hundred eighty-four thousand, fifty-five".