2620445618 has 18 divisors (see below), whose sum is σ = 4573294623. Its totient is φ = 1122830940.

The previous prime is 2620445609. The next prime is 2620445627. The reversal of 2620445618 is 8165440262.

It is an interprime number because it is at equal distance from previous prime (2620445609) and next prime (2620445627).

It can be written as a sum of positive squares in only one way, i.e., 1310222809 + 1310222809 = 36197^2 + 36197^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=36197.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 504173 + ... + 509343.

Almost surely, 2^2620445618 is an apocalyptic number.

2620445618 is a deficient number, since it is larger than the sum of its proper divisors (1952849005).

2620445618 is an frugal number, since it uses more digits than its factorization.

2620445618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358 (or 5180 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 2620445618 is about 51190.2883172189. The cubic root of 2620445618 is about 1378.6638362221.

The spelling of 2620445618 in words is "two billion, six hundred twenty million, four hundred forty-five thousand, six hundred eighteen".