2645634816 has 216 divisors, whose sum is σ = 8392500480. Its totient is φ = 794880000.

The previous prime is 2645634773. The next prime is 2645634853. The reversal of 2645634816 is 6184365462.

2645634816 is a `hidden beast` number, since 2 + 6 + 4 + 5 + 634 + 8 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3522441 + ... + 3523191.

Almost surely, 2^2645634816 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 2645634816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4196250240).

2645634816 is an abundant number, since it is smaller than the sum of its proper divisors (5746865664).

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

2645634816 is a wasteful number, since it uses less digits than its factorization.

2645634816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 906 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 2645634816 is about 51435.7348153985. The cubic root of 2645634816 is about 1383.0672543965.

The spelling of 2645634816 in words is "two billion, six hundred forty-five million, six hundred thirty-four thousand, eight hundred sixteen".