1055553778 has 32 divisors (see below), whose sum is σ = 1720454400. Its totient is φ = 484119504.

The previous prime is 1055553773. The next prime is 1055553787. The reversal of 1055553778 is 8773555501.

It is a super-2 number, since 2×1055553778² = 2228387556500146568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1055553773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146701 + ... + 153727.

It is an arithmetic number, because the mean of its divisors is an integer number (53764200).

Almost surely, 2^1055553778 is an apocalyptic number.

1055553778 is a deficient number, since it is larger than the sum of its proper divisors (664900622).

1055553778 is a wasteful number, since it uses less digits than its factorization.

1055553778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174.

The product of its (nonzero) digits is 735000, while the sum is 46.

The square root of 1055553778 is about 32489.2871266822. The cubic root of 1055553778 is about 1018.1852191730.

It can be divided in two parts, 1055553 and 778, that added together give a triangular number (1056331 = T₁₄₅₃).

The spelling of 1055553778 in words is "one billion, fifty-five million, five hundred fifty-three thousand, seven hundred seventy-eight".