642731137246 has 8 divisors (see below), whose sum is σ = 1051741860984. Its totient is φ = 292150516920.

The previous prime is 642731137231. The next prime is 642731137249.

It is a happy number.

642731137246 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 = 642731137196 and 642731137205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642731137249) 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, 14607525825 + ... + 14607525868.

It is an arithmetic number, because the mean of its divisors is an integer number (131467732623).

Almost surely, 2^642731137246 is an apocalyptic number.

642731137246 is a deficient number, since it is larger than the sum of its proper divisors (409010723738).

642731137246 is a wasteful number, since it uses less digits than its factorization.

642731137246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29215051706.

The product of its digits is 1016064, while the sum is 46.

It can be divided in two parts, 642731 and 137246, that added together give a palindrome (779977).

The spelling of 642731137246 in words is "six hundred forty-two billion, seven hundred thirty-one million, one hundred thirty-seven thousand, two hundred forty-six".