404021425315566 has 128 divisors (see below), whose sum is σ = 844271851991040. Its totient is φ = 128793821764608.

The previous prime is 404021425315517. The next prime is 404021425315567. The reversal of 404021425315566 is 665513524120404.

It is a super-2 number, since 2×404021425315566² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404021425315567) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2013874270 + ... + 2014074878.

It is an arithmetic number, because the mean of its divisors is an integer number (6595873843680).

Almost surely, 2^{404021425315566} is an apocalyptic number.

404021425315566 is an abundant number, since it is smaller than the sum of its proper divisors (440250426675474).

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

404021425315566 is a wasteful number, since it uses less digits than its factorization.

404021425315566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201430.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 404021425315566 in words is "four hundred four trillion, twenty-one billion, four hundred twenty-five million, three hundred fifteen thousand, five hundred sixty-six".