55587021361 has 9 divisors (see below), whose sum is σ = 56920187289. Its totient is φ = 54284397636.

The previous prime is 55587021353. The next prime is 55587021403. The reversal of 55587021361 is 16312078555.

It is a happy number.

The square root of 55587021361 is 235769.

It is a perfect power (a square), and thus also a powerful number.

55587021361 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 55587021361 - 2³ = 55587021353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55587021461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10135326 + ... + 10140808.

Almost surely, 2^55587021361 is an apocalyptic number.

55587021361 is the 235769-th square number.

55587021361 is the 117885-th centered octagonal number.

It is an amenable number.

55587021361 is a deficient number, since it is larger than the sum of its proper divisors (1333165928).

55587021361 is an frugal number, since it uses more digits than its factorization.

55587021361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11052 (or 5526 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 55587021361 in words is "fifty-five billion, five hundred eighty-seven million, twenty-one thousand, three hundred sixty-one".