55525781447 has 4 divisors (see below), whose sum is σ = 56228639520. Its totient is φ = 54822923376.

The previous prime is 55525781419. The next prime is 55525781501. The reversal of 55525781447 is 74418752555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55525781447 is a prime.

It is a super-2 number, since 2×55525781447² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55525781417) 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, 351428918 + ... + 351429075.

It is an arithmetic number, because the mean of its divisors is an integer number (14057159880).

Almost surely, 2^55525781447 is an apocalyptic number.

55525781447 is a deficient number, since it is larger than the sum of its proper divisors (702858073).

55525781447 is an equidigital number, since it uses as much as digits as its factorization.

55525781447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702858072.

The product of its digits is 7840000, while the sum is 53.

The spelling of 55525781447 in words is "fifty-five billion, five hundred twenty-five million, seven hundred eighty-one thousand, four hundred forty-seven".