1055778885666 has 24 divisors (see below), whose sum is σ = 2290667468544. Its totient is φ = 351442210680.

The previous prime is 1055778885643. The next prime is 1055778885683. The reversal of 1055778885666 is 6665888775501.

It is a super-2 number, since 2×1055778885666² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1055778885594 and 1055778885603.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40326930 + ... + 40353101.

It is an arithmetic number, because the mean of its divisors is an integer number (95444477856).

Almost surely, 2^{1055778885666} is an apocalyptic number.

1055778885666 is an abundant number, since it is smaller than the sum of its proper divisors (1234888582878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1055778885666 is a wasteful number, since it uses less digits than its factorization.

1055778885666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80680766 (or 80680763 counting only the distinct ones).

The product of its (nonzero) digits is 677376000, while the sum is 72.

The spelling of 1055778885666 in words is "one trillion, fifty-five billion, seven hundred seventy-eight million, eight hundred eighty-five thousand, six hundred sixty-six".