642637736246 has 8 divisors (see below), whose sum is σ = 1051589022984. Its totient is φ = 292108061920.

The previous prime is 642637736177. The next prime is 642637736297.

642637736246 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 642637736191 and 642637736200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14605403075 + ... + 14605403118.

It is an arithmetic number, because the mean of its divisors is an integer number (131448627873).

Almost surely, 2^642637736246 is an apocalyptic number.

642637736246 is a deficient number, since it is larger than the sum of its proper divisors (408951286738).

642637736246 is a wasteful number, since it uses less digits than its factorization.

642637736246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29210806206.

The product of its digits is 36578304, while the sum is 56.

The spelling of 642637736246 in words is "six hundred forty-two billion, six hundred thirty-seven million, seven hundred thirty-six thousand, two hundred forty-six".