643262663158 has 4 divisors (see below), whose sum is σ = 964893994740. Its totient is φ = 321631331578.

The previous prime is 643262663129. The next prime is 643262663161. The reversal of 643262663158 is 851366262346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 851366262346 = 2 ⋅425683131173.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160815665788 + ... + 160815665791.

It is an arithmetic number, because the mean of its divisors is an integer number (241223498685).

Almost surely, 2^643262663158 is an apocalyptic number.

643262663158 is a deficient number, since it is larger than the sum of its proper divisors (321631331582).

643262663158 is a wasteful number, since it uses less digits than its factorization.

643262663158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321631331581.

The product of its digits is 7464960, while the sum is 52.

The spelling of 643262663158 in words is "six hundred forty-three billion, two hundred sixty-two million, six hundred sixty-three thousand, one hundred fifty-eight".