643146164047 has 4 divisors (see below), whose sum is σ = 644131074600. Its totient is φ = 642161253496.

The previous prime is 643146164041. The next prime is 643146164053. The reversal of 643146164047 is 740461641346.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (643146164041) and next prime (643146164053).

It is a cyclic number.

It is not a de Polignac number, because 643146164047 - 2³⁹ = 93390350159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643146163988 and 643146164006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643146164041) 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, 492454297 + ... + 492455602.

It is an arithmetic number, because the mean of its divisors is an integer number (161032768650).

Almost surely, 2^643146164047 is an apocalyptic number.

643146164047 is a deficient number, since it is larger than the sum of its proper divisors (984910553).

643146164047 is an equidigital number, since it uses as much as digits as its factorization.

643146164047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984910552.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 643146164047 in words is "six hundred forty-three billion, one hundred forty-six million, one hundred sixty-four thousand, forty-seven".