55740821585 has 4 divisors (see below), whose sum is σ = 66888985908. Its totient is φ = 44592657264.

The previous prime is 55740821581. The next prime is 55740821597. The reversal of 55740821585 is 58512804755.

55740821585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58512804755 = 5 ⋅11702560951.

It can be written as a sum of positive squares in 2 ways, for example, as 19552988224 + 36187833361 = 139832^2 + 190231^2 .

It is a cyclic number.

It is not a de Polignac number, because 55740821585 - 2² = 55740821581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55740821581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5574082154 + ... + 5574082163.

It is an arithmetic number, because the mean of its divisors is an integer number (16722246477).

Almost surely, 2^55740821585 is an apocalyptic number.

It is an amenable number.

55740821585 is a deficient number, since it is larger than the sum of its proper divisors (11148164323).

55740821585 is a wasteful number, since it uses less digits than its factorization.

55740821585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11148164322.

The product of its (nonzero) digits is 2240000, while the sum is 50.

The spelling of 55740821585 in words is "fifty-five billion, seven hundred forty million, eight hundred twenty-one thousand, five hundred eighty-five".