2538649816 has 16 divisors (see below), whose sum is σ = 4767267600. Its totient is φ = 1267378464.

The previous prime is 2538649811. The next prime is 2538649819. The reversal of 2538649816 is 6189468352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2538649811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237756 + ... + 248203.

It is an arithmetic number, because the mean of its divisors is an integer number (297954225).

Almost surely, 2^2538649816 is an apocalyptic number.

It is an amenable number.

2538649816 is a deficient number, since it is larger than the sum of its proper divisors (2228617784).

2538649816 is a wasteful number, since it uses less digits than its factorization.

2538649816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486618 (or 486614 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 52.

The square root of 2538649816 is about 50385.0157884266. The cubic root of 2538649816 is about 1364.1671879643.

The spelling of 2538649816 in words is "two billion, five hundred thirty-eight million, six hundred forty-nine thousand, eight hundred sixteen".