53643140637640 has 32 divisors (see below), whose sum is σ = 120698971906680. Its totient is φ = 21456917504512.

The previous prime is 53643140637637. The next prime is 53643140637659. The reversal of 53643140637640 is 4673604134635.

It can be written as a sum of positive squares in 4 ways, for example, as 30327511589764 + 23315629047876 = 5507042^2 + 4828626^2 .

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, 8012869 + ... + 13095508.

Almost surely, 2^{53643140637640} is an apocalyptic number.

It is an amenable number.

53643140637640 is an abundant number, since it is smaller than the sum of its proper divisors (67055831269040).

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

53643140637640 is a wasteful number, since it uses less digits than its factorization.

53643140637640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21171921 (or 21171917 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 52.

The spelling of 53643140637640 in words is "fifty-three trillion, six hundred forty-three billion, one hundred forty million, six hundred thirty-seven thousand, six hundred forty".