643142731422 has 16 divisors (see below), whose sum is σ = 1286300172672. Its totient is φ = 214378458840.

The previous prime is 643142731421. The next prime is 643142731423. The reversal of 643142731422 is 224137241346.

It is an interprime number because it is at equal distance from previous prime (643142731421) and next prime (643142731423).

It is a super-2 number, since 2×643142731422² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643142731421) 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, 3103 + ... + 1134149.

It is an arithmetic number, because the mean of its divisors is an integer number (80393760792).

Almost surely, 2^643142731422 is an apocalyptic number.

643142731422 is an abundant number, since it is smaller than the sum of its proper divisors (643157441250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643142731422 is a wasteful number, since it uses less digits than its factorization.

643142731422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225823.

The product of its digits is 193536, while the sum is 39.

Adding to 643142731422 its reverse (224137241346), we get a palindrome (867279972768).

The spelling of 643142731422 in words is "six hundred forty-three billion, one hundred forty-two million, seven hundred thirty-one thousand, four hundred twenty-two".