55771787718418 has 8 divisors (see below), whose sum is σ = 83658313196748. Its totient is φ = 27885683319504.

The previous prime is 55771787718347. The next prime is 55771787718433. The reversal of 55771787718418 is 81481778717755.

It can be written as a sum of positive squares in 2 ways, for example, as 54635203582969 + 1136584135449 = 7391563^2 + 1066107^2 .

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

It is a super-2 number, since 2×55771787718418² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104938521 + ... + 105468652.

Almost surely, 2^{55771787718418} is an apocalyptic number.

55771787718418 is a deficient number, since it is larger than the sum of its proper divisors (27886525478330).

55771787718418 is a wasteful number, since it uses less digits than its factorization.

55771787718418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210539708.

The product of its digits is 860518400, while the sum is 76.

The spelling of 55771787718418 in words is "fifty-five trillion, seven hundred seventy-one billion, seven hundred eighty-seven million, seven hundred eighteen thousand, four hundred eighteen".