3966639979 has 2 divisors, whose sum is σ = 3966639980. Its totient is φ = 3966639978.

The previous prime is 3966639977. The next prime is 3966640001. The reversal of 3966639979 is 9799366693.

3966639979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3966639979 - 2¹ = 3966639977 is a prime.

It is a super-2 number, since 2×3966639979² = 31468465446002240882, which contains 22 as substring.

Together with 3966639977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3966639977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983319989 + 1983319990.

It is an arithmetic number, because the mean of its divisors is an integer number (1983319990).

Almost surely, 2^3966639979 is an apocalyptic number.

3966639979 is a deficient number, since it is larger than the sum of its proper divisors (1).

3966639979 is an equidigital number, since it uses as much as digits as its factorization.

3966639979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89282088, while the sum is 67.

The square root of 3966639979 is about 62981.2668894490. The cubic root of 3966639979 is about 1582.9757490199.

The spelling of 3966639979 in words is "three billion, nine hundred sixty-six million, six hundred thirty-nine thousand, nine hundred seventy-nine".