2221651625556 has 144 divisors (see below), whose sum is σ = 5999186439680. Its totient is φ = 637652347200.

The previous prime is 2221651625519. The next prime is 2221651625587. The reversal of 2221651625556 is 6555261561222.

It is a happy number.

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, 233582841 + ... + 233592351.

Almost surely, 2^{2221651625556} 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 2221651625556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2999593219840).

2221651625556 is an abundant number, since it is smaller than the sum of its proper divisors (3777534814124).

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

2221651625556 is a wasteful number, since it uses less digits than its factorization.

2221651625556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18026 (or 18013 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 48.

The spelling of 2221651625556 in words is "two trillion, two hundred twenty-one billion, six hundred fifty-one million, six hundred twenty-five thousand, five hundred fifty-six".