55191666893 has 8 divisors (see below), whose sum is σ = 62826878016. Its totient is φ = 47992753600.

The previous prime is 55191666889. The next prime is 55191666917. The reversal of 55191666893 is 39866619155.

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

It is not a de Polignac number, because 55191666893 - 2² = 55191666889 is a prime.

It is a super-2 number, since 2×55191666893² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55191666823) 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 7 ways as a sum of consecutive naturals, for example, 109074188 + ... + 109074693.

It is an arithmetic number, because the mean of its divisors is an integer number (7853359752).

Almost surely, 2^55191666893 is an apocalyptic number.

It is an amenable number.

55191666893 is a deficient number, since it is larger than the sum of its proper divisors (7635211123).

55191666893 is a wasteful number, since it uses less digits than its factorization.

55191666893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218148915.

The product of its digits is 10497600, while the sum is 59.

The spelling of 55191666893 in words is "fifty-five billion, one hundred ninety-one million, six hundred sixty-six thousand, eight hundred ninety-three".