643620512147 has 2 divisors, whose sum is σ = 643620512148. Its totient is φ = 643620512146.

The previous prime is 643620512107. The next prime is 643620512177. The reversal of 643620512147 is 741215026346.

643620512147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643620512147 - 2¹² = 643620508051 is a prime.

It is not a weakly prime, because it can be changed into another prime (643620512107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321810256073 + 321810256074.

It is an arithmetic number, because the mean of its divisors is an integer number (321810256074).

Almost surely, 2^643620512147 is an apocalyptic number.

643620512147 is a deficient number, since it is larger than the sum of its proper divisors (1).

643620512147 is an equidigital number, since it uses as much as digits as its factorization.

643620512147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 643620512147 in words is "six hundred forty-three billion, six hundred twenty million, five hundred twelve thousand, one hundred forty-seven".