643777052 has 6 divisors (see below), whose sum is σ = 1126609848. Its totient is φ = 321888524.

The previous prime is 643777051. The next prime is 643777067. The reversal of 643777052 is 250777346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643777051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80472128 + ... + 80472135.

It is an arithmetic number, because the mean of its divisors is an integer number (187768308).

Almost surely, 2^643777052 is an apocalyptic number.

It is an amenable number.

643777052 is a deficient number, since it is larger than the sum of its proper divisors (482832796).

643777052 is a wasteful number, since it uses less digits than its factorization.

643777052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160944267 (or 160944265 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 41.

The square root of 643777052 is about 25372.7620096827. The cubic root of 643777052 is about 863.4658460335.

The spelling of 643777052 in words is "six hundred forty-three million, seven hundred seventy-seven thousand, fifty-two".