55618907 has 4 divisors (see below), whose sum is σ = 56802336. Its totient is φ = 54435480.

The previous prime is 55618891. The next prime is 55618931. The reversal of 55618907 is 70981655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70981655 = 5 ⋅14196331.

It is a cyclic number.

It is not a de Polignac number, because 55618907 - 2⁴ = 55618891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55618957) 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, 591644 + ... + 591737.

It is an arithmetic number, because the mean of its divisors is an integer number (14200584).

Almost surely, 2^55618907 is an apocalyptic number.

55618907 is a deficient number, since it is larger than the sum of its proper divisors (1183429).

55618907 is a wasteful number, since it uses less digits than its factorization.

55618907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183428.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 55618907 is about 7457.8084582537. The cubic root of 55618907 is about 381.7163976904.

The spelling of 55618907 in words is "fifty-five million, six hundred eighteen thousand, nine hundred seven".