53505251440 has 80 divisors (see below), whose sum is σ = 130029945408. Its totient is φ = 20436635648.

The previous prime is 53505251431. The next prime is 53505251467. The reversal of 53505251440 is 4415250535.

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

It is a junction number, because it is equal to n+sod(n) for n = 53505251396 and 53505251405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066602 + ... + 1115638.

Almost surely, 2^53505251440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53505251440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65014972704).

53505251440 is an abundant number, since it is smaller than the sum of its proper divisors (76524693968).

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

53505251440 is a wasteful number, since it uses less digits than its factorization.

53505251440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49666 (or 49660 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 53505251440 in words is "fifty-three billion, five hundred five million, two hundred fifty-one thousand, four hundred forty".