4078065861 has 12 divisors (see below), whose sum is σ = 6034211820. Its totient is φ = 2652400320.

The previous prime is 4078065851. The next prime is 4078065877. The reversal of 4078065861 is 1685608704.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 258084225 + 3819981636 = 16065^2 + 61806^2 .

It is not a de Polignac number, because 4078065861 - 2⁵ = 4078065829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4078065821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5525466 + ... + 5526203.

It is an arithmetic number, because the mean of its divisors is an integer number (502850985).

Almost surely, 2^4078065861 is an apocalyptic number.

4078065861 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4078065861 is a deficient number, since it is larger than the sum of its proper divisors (1956145959).

4078065861 is a wasteful number, since it uses less digits than its factorization.

4078065861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051716 (or 11051713 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 4078065861 is about 63859.7358356578. The cubic root of 4078065861 is about 1597.6614091870.

The spelling of 4078065861 in words is "four billion, seventy-eight million, sixty-five thousand, eight hundred sixty-one".