25621335330066 has 128 divisors (see below), whose sum is σ = 66317196096000. Its totient is φ = 7180159334400.

The previous prime is 25621335330049. The next prime is 25621335330089. The reversal of 25621335330066 is 66003353312652.

It is a happy number.

25621335330066 is a `hidden beast` number, since 2 + 5 + 6 + 2 + 1 + 335 + 3 + 300 + 6 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68911866 + ... + 69282666.

It is an arithmetic number, because the mean of its divisors is an integer number (518103094500).

Almost surely, 2^{25621335330066} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25621335330066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33158598048000).

25621335330066 is an abundant number, since it is smaller than the sum of its proper divisors (40695860765934).

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

25621335330066 is a wasteful number, since it uses less digits than its factorization.

25621335330066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374321 (or 374315 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

The spelling of 25621335330066 in words is "twenty-five trillion, six hundred twenty-one billion, three hundred thirty-five million, three hundred thirty thousand, sixty-six".