55145603 has 4 divisors (see below), whose sum is σ = 58389480. Its totient is φ = 51901728.

The previous prime is 55145591. The next prime is 55145627. The reversal of 55145603 is 30654155.

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 55145603 - 2¹⁴ = 55129219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55145693) 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, 1621913 + ... + 1621946.

It is an arithmetic number, because the mean of its divisors is an integer number (14597370).

Almost surely, 2^55145603 is an apocalyptic number.

55145603 is a deficient number, since it is larger than the sum of its proper divisors (3243877).

55145603 is a wasteful number, since it uses less digits than its factorization.

55145603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243876.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 55145603 is about 7426.0085510320. The cubic root of 55145603 is about 380.6305390321.

Adding to 55145603 its reverse (30654155), we get a palindrome (85799758).

The spelling of 55145603 in words is "fifty-five million, one hundred forty-five thousand, six hundred three".