3783642661 has 2 divisors, whose sum is σ = 3783642662. Its totient is φ = 3783642660.

The previous prime is 3783642641. The next prime is 3783642677. The reversal of 3783642661 is 1662463873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3746664100 + 36978561 = 61210^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 3783642661 - 2¹³ = 3783634469 is a prime.

It is a super-2 number, since 2×3783642661² = 28631903572278321842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3783642601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1891821330 + 1891821331.

It is an arithmetic number, because the mean of its divisors is an integer number (1891821331).

Almost surely, 2^3783642661 is an apocalyptic number.

It is an amenable number.

3783642661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3783642661 is an equidigital number, since it uses as much as digits as its factorization.

3783642661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 46.

The square root of 3783642661 is about 61511.3214050877. The cubic root of 3783642661 is about 1558.2484533926.

The spelling of 3783642661 in words is "three billion, seven hundred eighty-three million, six hundred forty-two thousand, six hundred sixty-one".