55771618719 has 4 divisors (see below), whose sum is σ = 74362158296. Its totient is φ = 37181079144.

The previous prime is 55771618717. The next prime is 55771618733. The reversal of 55771618719 is 91781617755.

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

It is not a de Polignac number, because 55771618719 - 2¹ = 55771618717 is a prime.

It is a super-2 number, since 2×55771618719² (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 (55771618717) 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, 9295269784 + ... + 9295269789.

It is an arithmetic number, because the mean of its divisors is an integer number (18590539574).

Almost surely, 2^55771618719 is an apocalyptic number.

55771618719 is a deficient number, since it is larger than the sum of its proper divisors (18590539577).

55771618719 is a wasteful number, since it uses less digits than its factorization.

55771618719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18590539576.

The product of its digits is 3704400, while the sum is 57.

The spelling of 55771618719 in words is "fifty-five billion, seven hundred seventy-one million, six hundred eighteen thousand, seven hundred nineteen".