643262655 has 16 divisors (see below), whose sum is σ = 1176251904. Its totient is φ = 294062880.

The previous prime is 643262623. The next prime is 643262657. The reversal of 643262655 is 556262346.

It is not a de Polignac number, because 643262655 - 2⁵ = 643262623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643262657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3063051 + ... + 3063260.

It is an arithmetic number, because the mean of its divisors is an integer number (73515744).

Almost surely, 2^643262655 is an apocalyptic number.

643262655 is a deficient number, since it is larger than the sum of its proper divisors (532989249).

643262655 is a wasteful number, since it uses less digits than its factorization.

643262655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126326.

The product of its digits is 259200, while the sum is 39.

The square root of 643262655 is about 25362.6231884638. The cubic root of 643262655 is about 863.2358064610.

The spelling of 643262655 in words is "six hundred forty-three million, two hundred sixty-two thousand, six hundred fifty-five".