55555511 has 8 divisors (see below), whose sum is σ = 63241344. Its totient is φ = 48308920.

The previous prime is 55555481. The next prime is 55555517. The reversal of 55555511 is 11555555.

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

It is a de Polignac number, because none of the positive numbers 2^k-55555511 is a prime.

It is a super-2 number, since 2×55555511² = 6172829604942242, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555517) 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, 109541 + ... + 110046.

It is an arithmetic number, because the mean of its divisors is an integer number (7905168).

Almost surely, 2^55555511 is an apocalyptic number.

55555511 is a deficient number, since it is larger than the sum of its proper divisors (7685833).

55555511 is a wasteful number, since it uses less digits than its factorization.

55555511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219621.

The product of its digits is 15625, while the sum is 32.

The square root of 55555511 is about 7453.5569361212. The cubic root of 55555511 is about 381.5713121777.

The spelling of 55555511 in words is "fifty-five million, five hundred fifty-five thousand, five hundred eleven".