55240661 has 4 divisors (see below), whose sum is σ = 63132192. Its totient is φ = 47349132.

The previous prime is 55240643. The next prime is 55240693. The reversal of 55240661 is 16604255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55240661 - 2¹⁰ = 55239637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55240631) 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, 3945755 + ... + 3945768.

It is an arithmetic number, because the mean of its divisors is an integer number (15783048).

Almost surely, 2^55240661 is an apocalyptic number.

It is an amenable number.

55240661 is a deficient number, since it is larger than the sum of its proper divisors (7891531).

55240661 is an equidigital number, since it uses as much as digits as its factorization.

55240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891530.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 55240661 is about 7432.4061379879. The cubic root of 55240661 is about 380.8491192148.

The spelling of 55240661 in words is "fifty-five million, two hundred forty thousand, six hundred sixty-one".