53784402561 has 6 divisors (see below), whose sum is σ = 77688581490. Its totient is φ = 35856268368.

The previous prime is 53784402541. The next prime is 53784402619. The reversal of 53784402561 is 16520448735.

53784402561 is a `hidden beast` number, since 5 + 3 + 7 + 84 + 4 + 0 + 2 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53705281536 + 79121025 = 231744^2 + 8895^2 .

It is a de Polignac number, because none of the positive numbers 2^k-53784402561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53784402521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2988022356 + ... + 2988022373.

It is an arithmetic number, because the mean of its divisors is an integer number (12948096915).

Almost surely, 2^53784402561 is an apocalyptic number.

It is an amenable number.

53784402561 is a deficient number, since it is larger than the sum of its proper divisors (23904178929).

53784402561 is a wasteful number, since it uses less digits than its factorization.

53784402561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976044735 (or 5976044732 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 53784402561 in words is "fifty-three billion, seven hundred eighty-four million, four hundred two thousand, five hundred sixty-one".