1668778055 has 48 divisors (see below), whose sum is σ = 2491554816. Its totient is φ = 1066060800.

The previous prime is 1668778043. The next prime is 1668778079. The reversal of 1668778055 is 5508778661.

It is not a de Polignac number, because 1668778055 - 2⁴ = 1668778039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668777988 and 1668778006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 418682 + ... + 422648.

It is an arithmetic number, because the mean of its divisors is an integer number (51907392).

Almost surely, 2^1668778055 is an apocalyptic number.

1668778055 is a deficient number, since it is larger than the sum of its proper divisors (822776761).

1668778055 is a wasteful number, since it uses less digits than its factorization.

1668778055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104 (or 4097 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 1668778055 is about 40850.6799821007. The cubic root of 1668778055 is about 1186.1315557606.

The spelling of 1668778055 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, fifty-five".