55555617 has 8 divisors (see below), whose sum is σ = 79772224. Its totient is φ = 34188048.

The previous prime is 55555579. The next prime is 55555631. The reversal of 55555617 is 71655555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55555617 - 2⁶ = 55555553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1424503 = 55555617 / (5 + 5 + 5 + 5 + 5 + 6 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55555217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712213 + ... + 712290.

It is an arithmetic number, because the mean of its divisors is an integer number (9971528).

Almost surely, 2^55555617 is an apocalyptic number.

It is an amenable number.

55555617 is a deficient number, since it is larger than the sum of its proper divisors (24216607).

55555617 is a wasteful number, since it uses less digits than its factorization.

55555617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424519.

The product of its digits is 131250, while the sum is 39.

The square root of 55555617 is about 7453.5640468168. The cubic root of 55555617 is about 381.5715548571.

The spelling of 55555617 in words is "fifty-five million, five hundred fifty-five thousand, six hundred seventeen".