646243612142 has 16 divisors (see below), whose sum is σ = 1071012432672. Its totient is φ = 290892264960.

The previous prime is 646243612141. The next prime is 646243612163. The reversal of 646243612142 is 241216342646.

It is a self number, because there is not a number n which added to its sum of digits gives 646243612142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646243612141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413198459 + ... + 413200022.

It is an arithmetic number, because the mean of its divisors is an integer number (66938277042).

Almost surely, 2^646243612142 is an apocalyptic number.

646243612142 is a deficient number, since it is larger than the sum of its proper divisors (424768820530).

646243612142 is a wasteful number, since it uses less digits than its factorization.

646243612142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826398523.

The product of its digits is 331776, while the sum is 41.

Adding to 646243612142 its reverse (241216342646), we get a palindrome (887459954788).

The spelling of 646243612142 in words is "six hundred forty-six billion, two hundred forty-three million, six hundred twelve thousand, one hundred forty-two".