6390684919966 has 4 divisors (see below), whose sum is σ = 9586027379952. Its totient is φ = 3195342459982.

The previous prime is 6390684919963. The next prime is 6390684919991. The reversal of 6390684919966 is 6699194860936.

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 = 6390684919892 and 6390684919901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390684919963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597671229990 + ... + 1597671229993.

It is an arithmetic number, because the mean of its divisors is an integer number (2396506844988).

Almost surely, 2^{6390684919966} is an apocalyptic number.

6390684919966 is a deficient number, since it is larger than the sum of its proper divisors (3195342459986).

6390684919966 is a wasteful number, since it uses less digits than its factorization.

6390684919966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195342459985.

The product of its (nonzero) digits is 816293376, while the sum is 76.

The spelling of 6390684919966 in words is "six trillion, three hundred ninety billion, six hundred eighty-four million, nine hundred nineteen thousand, nine hundred sixty-six".