643107755 has 16 divisors (see below), whose sum is σ = 792880704. Its totient is φ = 500459520.

The previous prime is 643107749. The next prime is 643107791. The reversal of 643107755 is 557701346.

643107755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643107755 - 2⁸ = 643107499 is a prime.

It is a super-2 number, since 2×643107755² = 827175169082280050, which contains 22 as substring.

It is a Duffinian number.

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, 67922 + ... + 76808.

It is an arithmetic number, because the mean of its divisors is an integer number (49555044).

Almost surely, 2^643107755 is an apocalyptic number.

643107755 is a deficient number, since it is larger than the sum of its proper divisors (149772949).

643107755 is a wasteful number, since it uses less digits than its factorization.

643107755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9286.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 643107755 is about 25359.5692983931. The cubic root of 643107755 is about 863.1665107853.

The spelling of 643107755 in words is "six hundred forty-three million, one hundred seven thousand, seven hundred fifty-five".