53643898644 has 24 divisors (see below), whose sum is σ = 143050396608. Its totient is φ = 15326828160.

The previous prime is 53643898619. The next prime is 53643898673. The reversal of 53643898644 is 44689834635.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319308837 + ... + 319309004.

It is an arithmetic number, because the mean of its divisors is an integer number (5960433192).

Almost surely, 2^53643898644 is an apocalyptic number.

It is an amenable number.

53643898644 is an abundant number, since it is smaller than the sum of its proper divisors (89406497964).

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

53643898644 is a wasteful number, since it uses less digits than its factorization.

53643898644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638617855 (or 638617853 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 60.

The spelling of 53643898644 in words is "fifty-three billion, six hundred forty-three million, eight hundred ninety-eight thousand, six hundred forty-four".