55120011 has 8 divisors (see below), whose sum is σ = 73566864. Its totient is φ = 36709920.

The previous prime is 55120003. The next prime is 55120061. The reversal of 55120011 is 11002155.

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

It is not a de Polignac number, because 55120011 - 2³ = 55120003 is a prime.

It is a super-2 number, since 2×55120011² = 6076431225280242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55120061) 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, 5476 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (9195858).

Almost surely, 2^55120011 is an apocalyptic number.

55120011 is a deficient number, since it is larger than the sum of its proper divisors (18446853).

55120011 is a wasteful number, since it uses less digits than its factorization.

55120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18381.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 55120011 is about 7424.2852181203. The cubic root of 55120011 is about 380.5716488487.

Adding to 55120011 its reverse (11002155), we get a palindrome (66122166).

The spelling of 55120011 in words is "fifty-five million, one hundred twenty thousand, eleven".