646381183646 has 8 divisors (see below), whose sum is σ = 1057714664184. Its totient is φ = 293809628920.

The previous prime is 646381183619. The next prime is 646381183649.

646381183646 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646381183591 and 646381183600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646381183649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14690481425 + ... + 14690481468.

It is an arithmetic number, because the mean of its divisors is an integer number (132214333023).

Almost surely, 2^646381183646 is an apocalyptic number.

646381183646 is a deficient number, since it is larger than the sum of its proper divisors (411333480538).

646381183646 is a wasteful number, since it uses less digits than its factorization.

646381183646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29380962906.

The product of its digits is 11943936, while the sum is 56.

The spelling of 646381183646 in words is "six hundred forty-six billion, three hundred eighty-one million, one hundred eighty-three thousand, six hundred forty-six".