55818605197 has 4 divisors (see below), whose sum is σ = 55821153820. Its totient is φ = 55816056576.

The previous prime is 55818605191. The next prime is 55818605201. The reversal of 55818605197 is 79150681855.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38759371876 + 17059233321 = 196874^2 + 130611^2 .

It is a cyclic number.

It is not a de Polignac number, because 55818605197 - 2³ = 55818605189 is a prime.

It is a super-2 number, since 2×55818605197² (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 (55818605191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1241172 + ... + 1285357.

It is an arithmetic number, because the mean of its divisors is an integer number (13955288455).

Almost surely, 2^55818605197 is an apocalyptic number.

It is an amenable number.

55818605197 is a deficient number, since it is larger than the sum of its proper divisors (2548623).

55818605197 is a wasteful number, since it uses less digits than its factorization.

55818605197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548622.

The product of its (nonzero) digits is 3024000, while the sum is 55.

The spelling of 55818605197 in words is "fifty-five billion, eight hundred eighteen million, six hundred five thousand, one hundred ninety-seven".