1623655565 has 16 divisors (see below), whose sum is σ = 2231323392. Its totient is φ = 1111065984.

The previous prime is 1623655559. The next prime is 1623655577. The reversal of 1623655565 is 5655563261.

It is a de Polignac number, because none of the positive numbers 2^k-1623655565 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30584 + ... + 64673.

It is an arithmetic number, because the mean of its divisors is an integer number (139457712).

Almost surely, 2^1623655565 is an apocalyptic number.

It is an amenable number.

1623655565 is a deficient number, since it is larger than the sum of its proper divisors (607667827).

1623655565 is an equidigital number, since it uses as much as digits as its factorization.

1623655565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95756.

The product of its digits is 810000, while the sum is 44.

The square root of 1623655565 is about 40294.6096270953. The cubic root of 1623655565 is about 1175.3430270545.

The spelling of 1623655565 in words is "one billion, six hundred twenty-three million, six hundred fifty-five thousand, five hundred sixty-five".