55120065 has 64 divisors (see below), whose sum is σ = 118444032. Its totient is φ = 21139200.

The previous prime is 55120063. The next prime is 55120081. The reversal of 55120065 is 56002155.

It is not a de Polignac number, because 55120065 - 2¹ = 55120063 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 13180 + ... + 16850.

It is an arithmetic number, because the mean of its divisors is an integer number (1850688).

Almost surely, 2^55120065 is an apocalyptic number.

55120065 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55120065 is an abundant number, since it is smaller than the sum of its proper divisors (63323967).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55120065 is a wasteful number, since it uses less digits than its factorization.

55120065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 55120065 is about 7424.2888548332. The cubic root of 55120065 is about 380.5717731282.

The spelling of 55120065 in words is "fifty-five million, one hundred twenty thousand, sixty-five".