643160998 has 4 divisors (see below), whose sum is σ = 964741500. Its totient is φ = 321580498.

The previous prime is 643160993. The next prime is 643161007. The reversal of 643160998 is 899061346.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643160993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160790248 + ... + 160790251.

It is an arithmetic number, because the mean of its divisors is an integer number (241185375).

Almost surely, 2^643160998 is an apocalyptic number.

643160998 is a deficient number, since it is larger than the sum of its proper divisors (321580502).

643160998 is a wasteful number, since it uses less digits than its factorization.

643160998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321580501.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 643160998 is about 25360.6190381860. The cubic root of 643160998 is about 863.1903306952.

The spelling of 643160998 in words is "six hundred forty-three million, one hundred sixty thousand, nine hundred ninety-eight".