55213525520 has 40 divisors (see below), whose sum is σ = 128781637656. Its totient is φ = 22014839808.

The previous prime is 55213525483. The next prime is 55213525529. The reversal of 55213525520 is 2552531255.

55213525520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8086325776 + 47127199744 = 89924^2 + 217088^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (55213525529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1077467 + ... + 1127546.

Almost surely, 2^55213525520 is an apocalyptic number.

It is an amenable number.

55213525520 is an abundant number, since it is smaller than the sum of its proper divisors (73568112136).

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

55213525520 is a wasteful number, since it uses less digits than its factorization.

55213525520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205339 (or 2205333 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 55213525520 in words is "fifty-five billion, two hundred thirteen million, five hundred twenty-five thousand, five hundred twenty".