53521812909 has 16 divisors (see below), whose sum is σ = 80591439040. Its totient is φ = 35096269680.

The previous prime is 53521812901. The next prime is 53521812917. The reversal of 53521812909 is 90921812535.

53521812909 is a `hidden beast` number, since 5 + 352 + 1 + 8 + 1 + 290 + 9 = 666.

53521812909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (53521812901) and next prime (53521812917).

It is not a de Polignac number, because 53521812909 - 2³ = 53521812901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53521812901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16246627 + ... + 16249920.

It is an arithmetic number, because the mean of its divisors is an integer number (5036964940).

Almost surely, 2^53521812909 is an apocalyptic number.

It is an amenable number.

53521812909 is a deficient number, since it is larger than the sum of its proper divisors (27069626131).

53521812909 is a wasteful number, since it uses less digits than its factorization.

53521812909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32496617 (or 32496611 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 53521812909 in words is "fifty-three billion, five hundred twenty-one million, eight hundred twelve thousand, nine hundred nine".