654543656440 has 16 divisors (see below), whose sum is σ = 1472723227080. Its totient is φ = 261817462560.

The previous prime is 654543656399. The next prime is 654543656447. The reversal of 654543656440 is 44656345456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654543656447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8181795666 + ... + 8181795745.

Almost surely, 2^654543656440 is an apocalyptic number.

It is an amenable number.

654543656440 is an abundant number, since it is smaller than the sum of its proper divisors (818179570640).

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

654543656440 is a wasteful number, since it uses less digits than its factorization.

654543656440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16363591422 (or 16363591418 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 52.

The spelling of 654543656440 in words is "six hundred fifty-four billion, five hundred forty-three million, six hundred fifty-six thousand, four hundred forty".