53665408512 has 240 divisors, whose sum is σ = 169654811040. Its totient is φ = 16254959616.

The previous prime is 53665408493. The next prime is 53665408547. The reversal of 53665408512 is 21580456635.

53665408512 is a `hidden beast` number, since 5 + 36 + 65 + 40 + 8 + 512 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2259933 + ... + 2283555.

It is an arithmetic number, because the mean of its divisors is an integer number (706895046).

Almost surely, 2^53665408512 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 53665408512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84827405520).

53665408512 is an abundant number, since it is smaller than the sum of its proper divisors (115989402528).

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

53665408512 is a wasteful number, since it uses less digits than its factorization.

53665408512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23693 (or 23674 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 53665408512 in words is "fifty-three billion, six hundred sixty-five million, four hundred eight thousand, five hundred twelve".