1778869065 has 16 divisors (see below), whose sum is σ = 2874373056. Its totient is φ = 939336000.

The previous prime is 1778869039. The next prime is 1778869067. The reversal of 1778869065 is 5609688771.

It is not a de Polignac number, because 1778869065 - 2⁷ = 1778868937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1778868996 and 1778869014.

It is not an unprimeable number, because it can be changed into a prime (1778869067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585571 + ... + 588600.

It is an arithmetic number, because the mean of its divisors is an integer number (179648316).

Almost surely, 2^1778869065 is an apocalyptic number.

1778869065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1778869065 is a deficient number, since it is larger than the sum of its proper divisors (1095503991).

1778869065 is a wasteful number, since it uses less digits than its factorization.

1778869065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174280.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The square root of 1778869065 is about 42176.6412247348. The cubic root of 1778869065 is about 1211.6615529133.

The spelling of 1778869065 in words is "one billion, seven hundred seventy-eight million, eight hundred sixty-nine thousand, sixty-five".