6661905937 has 2 divisors, whose sum is σ = 6661905938. Its totient is φ = 6661905936.

The previous prime is 6661905853. The next prime is 6661905961. The reversal of 6661905937 is 7395091666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5534020881 + 1127885056 = 74391^2 + 33584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661905937 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661905977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330952968 + 3330952969.

It is an arithmetic number, because the mean of its divisors is an integer number (3330952969).

Almost surely, 2^6661905937 is an apocalyptic number.

It is an amenable number.

6661905937 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661905937 is an equidigital number, since it uses as much as digits as its factorization.

6661905937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The square root of 6661905937 is about 81620.4994900178. The cubic root of 6661905937 is about 1881.6239492649.

The spelling of 6661905937 in words is "six billion, six hundred sixty-one million, nine hundred five thousand, nine hundred thirty-seven".