2640618816 has 112 divisors (see below), whose sum is σ = 7685519808. Its totient is φ = 800110080.

The previous prime is 2640618797. The next prime is 2640618833. The reversal of 2640618816 is 6188160462.

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 15 ways as a sum of consecutive naturals, for example, 250386 + ... + 260718.

Almost surely, 2^2640618816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640618816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3842759904).

2640618816 is an abundant number, since it is smaller than the sum of its proper divisors (5044900992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640618816 is a wasteful number, since it uses less digits than its factorization.

2640618816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381 (or 10349 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 2640618816 is about 51386.9518068546. The cubic root of 2640618816 is about 1382.1926244463.

The spelling of 2640618816 in words is "two billion, six hundred forty million, six hundred eighteen thousand, eight hundred sixteen".