53501660640 has 144 divisors (see below), whose sum is σ = 184281250608. Its totient is φ = 14133731328.

The previous prime is 53501660629. The next prime is 53501660699. The reversal of 53501660640 is 4606610535.

53501660640 is a `hidden beast` number, since 5 + 3 + 5 + 0 + 1 + 6 + 6 + 0 + 640 = 666.

53501660640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 53501660595 and 53501660604.

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, 19537 + ... + 327696.

It is an arithmetic number, because the mean of its divisors is an integer number (1279730907).

Almost surely, 2^53501660640 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 53501660640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92140625304).

53501660640 is an abundant number, since it is smaller than the sum of its proper divisors (130779589968).

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

53501660640 is a wasteful number, since it uses less digits than its factorization.

53501660640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347361 (or 347350 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 53501660640 in words is "fifty-three billion, five hundred one million, six hundred sixty thousand, six hundred forty".