643777054 has 4 divisors (see below), whose sum is σ = 965665584. Its totient is φ = 321888526.

The previous prime is 643777051. The next prime is 643777067. The reversal of 643777054 is 450777346.

643777054 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 643777054.

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, 160944262 + ... + 160944265.

It is an arithmetic number, because the mean of its divisors is an integer number (241416396).

Almost surely, 2^643777054 is an apocalyptic number.

643777054 is a deficient number, since it is larger than the sum of its proper divisors (321888530).

643777054 is a wasteful number, since it uses less digits than its factorization.

643777054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321888529.

The product of its (nonzero) digits is 493920, while the sum is 43.

The square root of 643777054 is about 25372.7620490951. The cubic root of 643777054 is about 863.4658469276.

The spelling of 643777054 in words is "six hundred forty-three million, seven hundred seventy-seven thousand, fifty-four".