53213553561 has 24 divisors (see below), whose sum is σ = 87390329760. Its totient is φ = 28619052672.

The previous prime is 53213553529. The next prime is 53213553577. The reversal of 53213553561 is 16535531235.

53213553561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 53213553561 - 2⁵ = 53213553529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53213553761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10644471 + ... + 10649468.

It is an arithmetic number, because the mean of its divisors is an integer number (3641263740).

Almost surely, 2^53213553561 is an apocalyptic number.

53213553561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53213553561 is a deficient number, since it is larger than the sum of its proper divisors (34176776199).

53213553561 is a wasteful number, since it uses less digits than its factorization.

53213553561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21293973 (or 21293966 counting only the distinct ones).

The product of its digits is 202500, while the sum is 39.

The spelling of 53213553561 in words is "fifty-three billion, two hundred thirteen million, five hundred fifty-three thousand, five hundred sixty-one".