3991616569366 has 4 divisors (see below), whose sum is σ = 5987424854052. Its totient is φ = 1995808284682.

The previous prime is 3991616569309. The next prime is 3991616569387. The reversal of 3991616569366 is 6639656161993.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 3991616569295 and 3991616569304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997904142340 + ... + 997904142343.

It is an arithmetic number, because the mean of its divisors is an integer number (1496856213513).

Almost surely, 2^{3991616569366} is an apocalyptic number.

3991616569366 is a deficient number, since it is larger than the sum of its proper divisors (1995808284686).

3991616569366 is a wasteful number, since it uses less digits than its factorization.

3991616569366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995808284685.

The product of its digits is 255091680, while the sum is 70.

The spelling of 3991616569366 in words is "three trillion, nine hundred ninety-one billion, six hundred sixteen million, five hundred sixty-nine thousand, three hundred sixty-six".