55511555 has 8 divisors (see below), whose sum is σ = 72669744. Its totient is φ = 40372000.

The previous prime is 55511543. The next prime is 55511557.

55511555 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 55511555 - 2¹⁶ = 55446019 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55511557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504596 + ... + 504705.

It is an arithmetic number, because the mean of its divisors is an integer number (9083718).

Almost surely, 2^55511555 is an apocalyptic number.

55511555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55511555 is a deficient number, since it is larger than the sum of its proper divisors (17158189).

55511555 is a wasteful number, since it uses less digits than its factorization.

55511555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009317.

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

The square root of 55511555 is about 7450.6076933362. The cubic root of 55511555 is about 381.4706514528.

The spelling of 55511555 in words is "fifty-five million, five hundred eleven thousand, five hundred fifty-five".