3961663801 has 2 divisors, whose sum is σ = 3961663802. Its totient is φ = 3961663800.

The previous prime is 3961663777. The next prime is 3961663883. The reversal of 3961663801 is 1083661693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3129283600 + 832380201 = 55940^2 + 28851^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961663801 - 2³¹ = 1814180153 is a prime.

It is not a weakly prime, because it can be changed into another prime (3961643801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980831900 + 1980831901.

It is an arithmetic number, because the mean of its divisors is an integer number (1980831901).

Almost surely, 2^3961663801 is an apocalyptic number.

It is an amenable number.

3961663801 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961663801 is an equidigital number, since it uses as much as digits as its factorization.

3961663801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 3961663801 is about 62941.7492686690. The cubic root of 3961663801 is about 1582.3135205827.

The spelling of 3961663801 in words is "three billion, nine hundred sixty-one million, six hundred sixty-three thousand, eight hundred one".