53686685840 has 20 divisors (see below), whose sum is σ = 124821544764. Its totient is φ = 21474674304.

The previous prime is 53686685827. The next prime is 53686685849. The reversal of 53686685840 is 4858668635.

It can be written as a sum of positive squares in 2 ways, for example, as 28213249024 + 25473436816 = 167968^2 + 159604^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 53686685840.

It is not an unprimeable number, because it can be changed into a prime (53686685849) 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, 335541707 + ... + 335541866.

Almost surely, 2^53686685840 is an apocalyptic number.

It is an amenable number.

53686685840 is an abundant number, since it is smaller than the sum of its proper divisors (71134858924).

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

53686685840 is a wasteful number, since it uses less digits than its factorization.

53686685840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671083586 (or 671083580 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 59.

The spelling of 53686685840 in words is "fifty-three billion, six hundred eighty-six million, six hundred eighty-five thousand, eight hundred forty".