53781566384640 has 80 divisors (see below), whose sum is σ = 171932945060448. Its totient is φ = 14341751033856.

The previous prime is 53781566384617. The next prime is 53781566384669. The reversal of 53781566384640 is 4648366518735.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 3501396382 + ... + 3501411741.

Almost surely, 2^{53781566384640} is an apocalyptic number.

It is an amenable number.

53781566384640 is an abundant number, since it is smaller than the sum of its proper divisors (118151378675808).

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

53781566384640 is an equidigital number, since it uses as much as digits as its factorization.

53781566384640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002808149 (or 7002808133 counting only the distinct ones).

The product of its (nonzero) digits is 348364800, while the sum is 66.

The spelling of 53781566384640 in words is "fifty-three trillion, seven hundred eighty-one billion, five hundred sixty-six million, three hundred eighty-four thousand, six hundred forty".