653981537540 has 24 divisors (see below), whose sum is σ = 1373391136320. Its totient is φ = 261586918368.

The previous prime is 653981537533. The next prime is 653981537551. The reversal of 653981537540 is 45735189356.

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, 655409 + ... + 1318151.

It is an arithmetic number, because the mean of its divisors is an integer number (57224630680).

Almost surely, 2^653981537540 is an apocalyptic number.

It is an amenable number.

653981537540 is an abundant number, since it is smaller than the sum of its proper divisors (719409598780).

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

653981537540 is a wasteful number, since it uses less digits than its factorization.

653981537540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712091 (or 712089 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 653981537540 in words is "six hundred fifty-three billion, nine hundred eighty-one million, five hundred thirty-seven thousand, five hundred forty".