55191930818 has 8 divisors (see below), whose sum is σ = 86387370048. Its totient is φ = 26396140804.

The previous prime is 55191930817. The next prime is 55191930823. The reversal of 55191930818 is 81803919155.

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

It is a super-2 number, since 2×55191930818² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55191930817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599912246 + ... + 599912337.

It is an arithmetic number, because the mean of its divisors is an integer number (10798421256).

Almost surely, 2^55191930818 is an apocalyptic number.

55191930818 is a deficient number, since it is larger than the sum of its proper divisors (31195439230).

55191930818 is a wasteful number, since it uses less digits than its factorization.

55191930818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199824608.

The product of its (nonzero) digits is 388800, while the sum is 50.

The spelling of 55191930818 in words is "fifty-five billion, one hundred ninety-one million, nine hundred thirty thousand, eight hundred eighteen".