1865041641 has 24 divisors (see below), whose sum is σ = 2816049600. Its totient is φ = 1187198496.

The previous prime is 1865041621. The next prime is 1865041663. The reversal of 1865041641 is 1461405681.

1865041641 is a `hidden beast` number, since 1 + 8 + 6 + 5 + 0 + 4 + 1 + 641 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1865041641 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1865041596 and 1865041605.

It is not an unprimeable number, because it can be changed into a prime (1865041621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113835 + ... + 129183.

It is an arithmetic number, because the mean of its divisors is an integer number (117335400).

Almost surely, 2^1865041641 is an apocalyptic number.

It is an amenable number.

1865041641 is a deficient number, since it is larger than the sum of its proper divisors (951007959).

1865041641 is a wasteful number, since it uses less digits than its factorization.

1865041641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15965 (or 15962 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1865041641 is about 43186.1278769005. The cubic root of 1865041641 is about 1230.9191008679.

The spelling of 1865041641 in words is "one billion, eight hundred sixty-five million, forty-one thousand, six hundred forty-one".