401122217656 has 64 divisors (see below), whose sum is σ = 823514791680. Its totient is φ = 182345226240.

The previous prime is 401122217653. The next prime is 401122217677. The reversal of 401122217656 is 656712221104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401122217653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2262906 + ... + 2433718.

It is an arithmetic number, because the mean of its divisors is an integer number (12867418620).

Almost surely, 2^401122217656 is an apocalyptic number.

It is an amenable number.

401122217656 is an abundant number, since it is smaller than the sum of its proper divisors (422392574024).

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

401122217656 is a wasteful number, since it uses less digits than its factorization.

401122217656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171424 (or 171420 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 401122217656 in words is "four hundred one billion, one hundred twenty-two million, two hundred seventeen thousand, six hundred fifty-six".