1905660641 has 2 divisors, whose sum is σ = 1905660642. Its totient is φ = 1905660640.

The previous prime is 1905660623. The next prime is 1905660643. The reversal of 1905660641 is 1460665091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1859420641 + 46240000 = 43121^2 + 6800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1905660641 is a prime.

Together with 1905660643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1905660595 and 1905660604.

It is not a weakly prime, because it can be changed into another prime (1905660643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952830320 + 952830321.

It is an arithmetic number, because the mean of its divisors is an integer number (952830321).

Almost surely, 2^1905660641 is an apocalyptic number.

It is an amenable number.

1905660641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1905660641 is an equidigital number, since it uses as much as digits as its factorization.

1905660641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1905660641 is about 43653.8731500425. The cubic root of 1905660641 is about 1239.7911200794.

It can be divided in two parts, 19056 and 60641, that added together give a palindrome (79697).

The spelling of 1905660641 in words is "one billion, nine hundred five million, six hundred sixty thousand, six hundred forty-one".