643473601 has 4 divisors (see below), whose sum is σ = 643530672.
Its totient is φ = 643416532.
The previous prime is 643473527. The next prime is 643473683. The reversal of 643473601 is 106374346.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is not a de Polignac number, because 643473601 - 27 = 643473473 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (643473101) 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, 5335 + ... + 36268.
It is an arithmetic number, because the mean of its divisors is an integer number (160882668).
Almost surely, 2643473601 is an apocalyptic number.
It is an amenable number.
643473601 is a deficient number, since it is larger than the sum of its proper divisors (57071).
643473601 is a wasteful number, since it uses less digits than its factorization.
643473601 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57070.
The product of its (nonzero) digits is 36288, while the sum is 34.
The square root of 643473601 is about 25366.7814473969.
The cubic root of 643473601 is about 863.3301568468.
The spelling of 643473601 in words is "six hundred forty-three million, four hundred seventy-three thousand, six hundred one".