53043921787 has 4 divisors (see below), whose sum is σ = 55350179280. Its totient is φ = 50737664296.

The previous prime is 53043921773. The next prime is 53043921793. The reversal of 53043921787 is 78712934035.

53043921787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78712934035 = 5 ⋅15742586807.

It is a cyclic number.

It is not a de Polignac number, because 53043921787 - 2²³ = 53035533179 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53043921787.

It is not an unprimeable number, because it can be changed into a prime (53043921767) 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, 1153128712 + ... + 1153128757.

It is an arithmetic number, because the mean of its divisors is an integer number (13837544820).

Almost surely, 2^53043921787 is an apocalyptic number.

53043921787 is a deficient number, since it is larger than the sum of its proper divisors (2306257493).

53043921787 is a wasteful number, since it uses less digits than its factorization.

53043921787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306257492.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 53043921787 in words is "fifty-three billion, forty-three million, nine hundred twenty-one thousand, seven hundred eighty-seven".