55415555 has 16 divisors (see below), whose sum is σ = 71940960.
Its totient is φ = 40735488.
The previous prime is 55415537. The next prime is 55415557. The reversal of 55415555 is 55551455.
It is a happy number.
It is a cyclic number.
It is not a de Polignac number, because 55415555 - 216 = 55350019 is a prime.
It is not an unprimeable number, because it can be changed into a prime (55415557) 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, 13316 + ... + 16974.
It is an arithmetic number, because the mean of its divisors is an integer number (4496310).
Almost surely, 255415555 is an apocalyptic number.
55415555 is a deficient number, since it is larger than the sum of its proper divisors (16525405).
55415555 is a wasteful number, since it uses less digits than its factorization.
55415555 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3910.
The product of its digits is 62500, while the sum is 35.
The square root of 55415555 is about 7444.1624780764.
The cubic root of 55415555 is about 381.2506233081.
The spelling of 55415555 in words is "fifty-five million, four hundred fifteen thousand, five hundred fifty-five".