643365155 has 16 divisors (see below), whose sum is σ = 785734560. Its totient is φ = 505604352.

The previous prime is 643365143. The next prime is 643365167. The reversal of 643365155 is 551563346.

643365155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643365143) and next prime (643365167).

It is a cyclic number.

It is not a de Polignac number, because 643365155 - 2¹⁶ = 643299619 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127847 + ... + 132783.

It is an arithmetic number, because the mean of its divisors is an integer number (49108410).

Almost surely, 2^643365155 is an apocalyptic number.

643365155 is a deficient number, since it is larger than the sum of its proper divisors (142369405).

643365155 is a wasteful number, since it uses less digits than its factorization.

643365155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398.

The product of its digits is 162000, while the sum is 38.

The square root of 643365155 is about 25364.6437980114. The cubic root of 643365155 is about 863.2816544880.

The spelling of 643365155 in words is "six hundred forty-three million, three hundred sixty-five thousand, one hundred fifty-five".