55657767657818 has 4 divisors (see below), whose sum is σ = 83486651486730. Its totient is φ = 27828883828908.

The previous prime is 55657767657757. The next prime is 55657767657827. The reversal of 55657767657818 is 81875676775655.

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

It can be written as a sum of positive squares in only one way, i.e., 43645353370369 + 12012414287449 = 6606463^2 + 3465893^2 .

It is a super-2 number, since 2×55657767657818² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13914441914453 + ... + 13914441914456.

Almost surely, 2^{55657767657818} is an apocalyptic number.

55657767657818 is a deficient number, since it is larger than the sum of its proper divisors (27828883828912).

55657767657818 is a wasteful number, since it uses less digits than its factorization.

55657767657818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27828883828911.

The product of its digits is 20744640000, while the sum is 83.

The spelling of 55657767657818 in words is "fifty-five trillion, six hundred fifty-seven billion, seven hundred sixty-seven million, six hundred fifty-seven thousand, eight hundred eighteen".