55665519 has 24 divisors (see below), whose sum is σ = 92982960. Its totient is φ = 29361024.

The previous prime is 55665509. The next prime is 55665523. The reversal of 55665519 is 91556655.

It is not a de Polignac number, because 55665519 - 2⁷ = 55665391 is a prime.

It is a super-2 number, since 2×55665519² = 6197300011078722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55665509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12654 + ... + 16475.

It is an arithmetic number, because the mean of its divisors is an integer number (3874290).

Almost surely, 2^55665519 is an apocalyptic number.

55665519 is a deficient number, since it is larger than the sum of its proper divisors (37317441).

55665519 is a wasteful number, since it uses less digits than its factorization.

55665519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29159 (or 29152 counting only the distinct ones).

The product of its digits is 202500, while the sum is 42.

The square root of 55665519 is about 7460.9328505221. The cubic root of 55665519 is about 381.8230017068.

The spelling of 55665519 in words is "fifty-five million, six hundred sixty-five thousand, five hundred nineteen".