661041422226 has 64 divisors (see below), whose sum is σ = 1518664012800. Its totient is φ = 212916211200.

The previous prime is 661041422201. The next prime is 661041422227. The reversal of 661041422226 is 622224140166.

661041422226 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 4 + 1 + 422 + 226 = 666.

It is not an unprimeable number, because it can be changed into a prime (661041422227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 807810 + ... + 1405218.

It is an arithmetic number, because the mean of its divisors is an integer number (23729125200).

Almost surely, 2^661041422226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661041422226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759332006400).

661041422226 is an abundant number, since it is smaller than the sum of its proper divisors (857622590574).

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

661041422226 is a wasteful number, since it uses less digits than its factorization.

661041422226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598112 (or 598106 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 661041422226 in words is "six hundred sixty-one billion, forty-one million, four hundred twenty-two thousand, two hundred twenty-six".