1778785145 has 8 divisors (see below), whose sum is σ = 2144115456. Its totient is φ = 1416645936.

The previous prime is 1778785103. The next prime is 1778785163. The reversal of 1778785145 is 5415878771.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1778785145 - 2²⁸ = 1510349689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796547 + ... + 798776.

It is an arithmetic number, because the mean of its divisors is an integer number (268014432).

Almost surely, 2^1778785145 is an apocalyptic number.

It is an amenable number.

1778785145 is a deficient number, since it is larger than the sum of its proper divisors (365330311).

1778785145 is a wasteful number, since it uses less digits than its factorization.

1778785145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595551.

The product of its digits is 2195200, while the sum is 53.

The square root of 1778785145 is about 42175.6463495226. The cubic root of 1778785145 is about 1211.6424988153.

The spelling of 1778785145 in words is "one billion, seven hundred seventy-eight million, seven hundred eighty-five thousand, one hundred forty-five".