55646557 has 4 divisors (see below), whose sum is σ = 57150556. Its totient is φ = 54142560.

The previous prime is 55646551. The next prime is 55646561. The reversal of 55646557 is 75564655.

55646557 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.

It can be written as a sum of positive squares in 2 ways, for example, as 34798201 + 20848356 = 5899^2 + 4566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55646557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55646551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751944 + ... + 752017.

It is an arithmetic number, because the mean of its divisors is an integer number (14287639).

Almost surely, 2^55646557 is an apocalyptic number.

It is an amenable number.

55646557 is a deficient number, since it is larger than the sum of its proper divisors (1503999).

55646557 is a wasteful number, since it uses less digits than its factorization.

55646557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503998.

The product of its digits is 630000, while the sum is 43.

The square root of 55646557 is about 7459.6619896615. The cubic root of 55646557 is about 381.7796418308.

It can be divided in two parts, 5564 and 6557, that added together give a palindrome (12121).

The spelling of 55646557 in words is "fifty-five million, six hundred forty-six thousand, five hundred fifty-seven".