55005550 has 24 divisors (see below), whose sum is σ = 102533616. Its totient is φ = 21954240.

The previous prime is 55005521. The next prime is 55005553. The reversal of 55005550 is 5550055.

It is a super-2 number, since 2×55005550² = 6051221061605000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 29959 + ... + 31741.

It is an arithmetic number, because the mean of its divisors is an integer number (4272234).

Almost surely, 2^55005550 is an apocalyptic number.

55005550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55005550 is a deficient number, since it is larger than the sum of its proper divisors (47528066).

55005550 is a wasteful number, since it uses less digits than its factorization.

55005550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412 (or 2407 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 25.

The square root of 55005550 is about 7416.5726585802. The cubic root of 55005550 is about 380.3080373951.

It can be divided in two parts, 55005 and 550, that added together give a palindrome (55555).

The spelling of 55005550 in words is "fifty-five million, five thousand, five hundred fifty".