55005555 has 16 divisors (see below), whose sum is σ = 96009984. Its totient is φ = 26669280.

The previous prime is 55005553. The next prime is 55005583. The reversal of 55005555 is 55550055.

It is not a de Polignac number, because 55005555 - 2¹ = 55005553 is a prime.

It is a super-2 number, since 2×55005555² = 6051222161716050, which contains 22 as substring.

55005555 is a modest number, since divided by 5555 gives 5500 as remainder.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55005553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166519 + ... + 166848.

It is an arithmetic number, because the mean of its divisors is an integer number (6000624).

Almost surely, 2^55005555 is an apocalyptic number.

55005555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55005555 is a deficient number, since it is larger than the sum of its proper divisors (41004429).

55005555 is a wasteful number, since it uses less digits than its factorization.

55005555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333386.

The product of its (nonzero) digits is 15625, while the sum is 30.

The square root of 55005555 is about 7416.5729956632. The cubic root of 55005555 is about 380.3080489184.

The spelling of 55005555 in words is "fifty-five million, five thousand, five hundred fifty-five".