3961663802 has 4 divisors (see below), whose sum is σ = 5942495706. Its totient is φ = 1980831900.

The previous prime is 3961663801. The next prime is 3961663883. The reversal of 3961663802 is 2083661693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2083661693 = 5861 ⋅355513.

It can be written as a sum of positive squares in only one way, i.e., 3946226761 + 15437041 = 62819^2 + 3929^2 .

It is not an unprimeable number, because it can be changed into a prime (3961663801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990415949 + ... + 990415952.

Almost surely, 2^3961663802 is an apocalyptic number.

3961663802 is a deficient number, since it is larger than the sum of its proper divisors (1980831904).

3961663802 is a wasteful number, since it uses less digits than its factorization.

3961663802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980831903.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 3961663802 is about 62941.7492766129. The cubic root of 3961663802 is about 1582.3135207158.

The spelling of 3961663802 in words is "three billion, nine hundred sixty-one million, six hundred sixty-three thousand, eight hundred two".