401144643636 has 48 divisors (see below), whose sum is σ = 1025332448448. Its totient is φ = 121054579200.

The previous prime is 401144643617. The next prime is 401144643667. The reversal of 401144643636 is 636346441104.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6273115 + ... + 6336738.

It is an arithmetic number, because the mean of its divisors is an integer number (21361092676).

Almost surely, 2^401144643636 is an apocalyptic number.

It is an amenable number.

401144643636 is an abundant number, since it is smaller than the sum of its proper divisors (624187804812).

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

401144643636 is a wasteful number, since it uses less digits than its factorization.

401144643636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12610112 (or 12610110 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 401144643636 in words is "four hundred one billion, one hundred forty-four million, six hundred forty-three thousand, six hundred thirty-six".