1778979758656 has 21 divisors (see below), whose sum is σ = 3530184132531. Its totient is φ = 889484544192.

The previous prime is 1778979758639. The next prime is 1778979758707. The reversal of 1778979758656 is 6568579798771.

The square root of 1778979758656 is 1333784.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 10586911 + ... + 10753633.

It is an arithmetic number, because the mean of its divisors is an integer number (168104006311).

Almost surely, 2^{1778979758656} is an apocalyptic number.

1778979758656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1778979758656 is the 1333784-th square number.

It is an amenable number.

1778979758656 is a deficient number, since it is larger than the sum of its proper divisors (1751204373875).

1778979758656 is an frugal number, since it uses more digits than its factorization.

1778979758656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333458 (or 166725 counting only the distinct ones).

The product of its digits is 11202105600, while the sum is 85.

The spelling of 1778979758656 in words is "one trillion, seven hundred seventy-eight billion, nine hundred seventy-nine million, seven hundred fifty-eight thousand, six hundred fifty-six".