643153106 has 4 divisors (see below), whose sum is σ = 964729662. Its totient is φ = 321576552.

The previous prime is 643153099. The next prime is 643153111. The reversal of 643153106 is 601351346.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 522351025 + 120802081 = 22855^2 + 10991^2 .

It is a super-3 number, since 3×643153106³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160788275 + ... + 160788278.

Almost surely, 2^643153106 is an apocalyptic number.

643153106 is a deficient number, since it is larger than the sum of its proper divisors (321576556).

643153106 is a wasteful number, since it uses less digits than its factorization.

643153106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321576555.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 643153106 is about 25360.4634421376. The cubic root of 643153106 is about 863.1868000468.

The spelling of 643153106 in words is "six hundred forty-three million, one hundred fifty-three thousand, one hundred six".