643071145 has 16 divisors (see below), whose sum is σ = 808612992. Its totient is φ = 490026240.

The previous prime is 643071133. The next prime is 643071167. The reversal of 643071145 is 541170346.

643071145 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 643071145 - 2⁵ = 643071113 is a prime.

It is a super-2 number, since 2×643071145² = 827080995063222050, 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, 16114 + ... + 39316.

It is an arithmetic number, because the mean of its divisors is an integer number (50538312).

Almost surely, 2^643071145 is an apocalyptic number.

It is an amenable number.

643071145 is a deficient number, since it is larger than the sum of its proper divisors (165541847).

643071145 is a wasteful number, since it uses less digits than its factorization.

643071145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23472.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 643071145 is about 25358.8474698674. The cubic root of 643071145 is about 863.1501314018.

The spelling of 643071145 in words is "six hundred forty-three million, seventy-one thousand, one hundred forty-five".