402426523656 has 96 divisors (see below), whose sum is σ = 1105954176600. Its totient is φ = 132179005440.

The previous prime is 402426523643. The next prime is 402426523661. The reversal of 402426523656 is 656325624204.

402426523656 is a `hidden beast` number, since 4 + 0 + 24 + 265 + 2 + 365 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 347234418756 + 55192104900 = 589266^2 + 234930^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1473526 + ... + 1725146.

Almost surely, 2^402426523656 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 402426523656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552977088300).

402426523656 is an abundant number, since it is smaller than the sum of its proper divisors (703527652944).

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

402426523656 is a wasteful number, since it uses less digits than its factorization.

402426523656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251959 (or 251952 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 45.

The spelling of 402426523656 in words is "four hundred two billion, four hundred twenty-six million, five hundred twenty-three thousand, six hundred fifty-six".