2645799664 has 80 divisors (see below), whose sum is σ = 5472935424. Its totient is φ = 1236435200.

The previous prime is 2645799581. The next prime is 2645799671. The reversal of 2645799664 is 4669975462.

2645799664 = T₂₄₂ + T₂₄₃ + ... + T₂₅₁₃.

It is a junction number, because it is equal to n+sod(n) for n = 2645799599 and 2645799608.

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, 3422382 + ... + 3423154.

Almost surely, 2^2645799664 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 2645799664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2736467712).

2645799664 is an abundant number, since it is smaller than the sum of its proper divisors (2827135760).

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

2645799664 is a wasteful number, since it uses less digits than its factorization.

2645799664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 1000 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 58.

The square root of 2645799664 is about 51437.3372561216. The cubic root of 2645799664 is about 1383.0959798444.

The spelling of 2645799664 in words is "two billion, six hundred forty-five million, seven hundred ninety-nine thousand, six hundred sixty-four".