2609521656 has 192 divisors, whose sum is σ = 7789802400. Its totient is φ = 726147072.

The previous prime is 2609521631. The next prime is 2609521667. The reversal of 2609521656 is 6561259062.

2609521656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9700690 + ... + 9700958.

Almost surely, 2^2609521656 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 2609521656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3894901200).

2609521656 is an abundant number, since it is smaller than the sum of its proper divisors (5180280744).

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

2609521656 is a wasteful number, since it uses less digits than its factorization.

2609521656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 2609521656 is about 51083.4773287802. The cubic root of 2609521656 is about 1376.7454032658.

The spelling of 2609521656 in words is "two billion, six hundred nine million, five hundred twenty-one thousand, six hundred fifty-six".