55561007 has 4 divisors (see below), whose sum is σ = 55576680. Its totient is φ = 55545336.

The previous prime is 55561001. The next prime is 55561043. The reversal of 55561007 is 70016555.

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

It is a cyclic number.

It is not a de Polignac number, because 55561007 - 2⁴ = 55560991 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 (55561001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (13894170).

Almost surely, 2^55561007 is an apocalyptic number.

55561007 is a deficient number, since it is larger than the sum of its proper divisors (15673).

55561007 is a wasteful number, since it uses less digits than its factorization.

55561007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15672.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 55561007 is about 7453.9256100393. The cubic root of 55561007 is about 381.5838944684.

The spelling of 55561007 in words is "fifty-five million, five hundred sixty-one thousand, seven".