55218697519 has 4 divisors (see below), whose sum is σ = 55228258360. Its totient is φ = 55209136680.

The previous prime is 55218697507. The next prime is 55218697553. The reversal of 55218697519 is 91579681255.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55218697519 - 2¹³ = 55218689327 is a prime.

It is a super-2 number, since 2×55218697519² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55218698519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4771752 + ... + 4783309.

It is an arithmetic number, because the mean of its divisors is an integer number (13807064590).

Almost surely, 2^55218697519 is an apocalyptic number.

55218697519 is a deficient number, since it is larger than the sum of its proper divisors (9560841).

55218697519 is an equidigital number, since it uses as much as digits as its factorization.

55218697519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560840.

The product of its digits is 6804000, while the sum is 58.

The spelling of 55218697519 in words is "fifty-five billion, two hundred eighteen million, six hundred ninety-seven thousand, five hundred nineteen".