643141134251 has 16 divisors (see below), whose sum is σ = 802362179328. Its totient is φ = 500821509600.

The previous prime is 643141134247. The next prime is 643141134257. The reversal of 643141134251 is 152431141346.

It is a cyclic number.

It is not a de Polignac number, because 643141134251 - 2² = 643141134247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643141134257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2609900 + ... + 2845673.

It is an arithmetic number, because the mean of its divisors is an integer number (50147636208).

Almost surely, 2^643141134251 is an apocalyptic number.

643141134251 is a deficient number, since it is larger than the sum of its proper divisors (159221045077).

643141134251 is a wasteful number, since it uses less digits than its factorization.

643141134251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5457122.

The product of its digits is 34560, while the sum is 35.

Adding to 643141134251 its reverse (152431141346), we get a palindrome (795572275597).

The spelling of 643141134251 in words is "six hundred forty-three billion, one hundred forty-one million, one hundred thirty-four thousand, two hundred fifty-one".