643226702139 has 24 divisors (see below), whose sum is σ = 1061939185632. Its totient is φ = 367521897600.

The previous prime is 643226702137. The next prime is 643226702141. The reversal of 643226702139 is 931207622346.

It is an interprime number because it is at equal distance from previous prime (643226702137) and next prime (643226702141).

It is not a de Polignac number, because 643226702139 - 2¹ = 643226702137 is a prime.

It is a super-2 number, since 2×643226702139² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643226702094 and 643226702103.

It is not an unprimeable number, because it can be changed into a prime (643226702137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148039 + ... + 1143839.

It is an arithmetic number, because the mean of its divisors is an integer number (44247466068).

Almost surely, 2^643226702139 is an apocalyptic number.

643226702139 is a deficient number, since it is larger than the sum of its proper divisors (418712483493).

643226702139 is a wasteful number, since it uses less digits than its factorization.

643226702139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006067 (or 1006064 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 643226702139 in words is "six hundred forty-three billion, two hundred twenty-six million, seven hundred two thousand, one hundred thirty-nine".