2644629569664 has 128 divisors (see below), whose sum is σ = 7240639222080. Its totient is φ = 854756474880.

The previous prime is 2644629569663. The next prime is 2644629569669. The reversal of 2644629569664 is 4669659264462.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (2644629569663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1677604 + ... + 2846684.

Almost surely, 2^{2644629569664} is an apocalyptic number.

2644629569664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2644629569664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3620319611040).

2644629569664 is an abundant number, since it is smaller than the sum of its proper divisors (4596009652416).

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

2644629569664 is a wasteful number, since it uses less digits than its factorization.

2644629569664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169278 (or 1169266 counting only the distinct ones).

The product of its digits is 806215680, while the sum is 69.

The spelling of 2644629569664 in words is "two trillion, six hundred forty-four billion, six hundred twenty-nine million, five hundred sixty-nine thousand, six hundred sixty-four".