643739031087 has 8 divisors (see below), whose sum is σ = 858551266560. Its totient is φ = 429043074840.

The previous prime is 643739031077. The next prime is 643739031151. The reversal of 643739031087 is 780130937346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643739031087 - 2⁴ = 643739031071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643739031037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29056887 + ... + 29079032.

It is an arithmetic number, because the mean of its divisors is an integer number (107318908320).

Almost surely, 2^643739031087 is an apocalyptic number.

643739031087 is a deficient number, since it is larger than the sum of its proper divisors (214812235473).

643739031087 is a wasteful number, since it uses less digits than its factorization.

643739031087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58139613.

The product of its (nonzero) digits is 2286144, while the sum is 51.

The spelling of 643739031087 in words is "six hundred forty-three billion, seven hundred thirty-nine million, thirty-one thousand, eighty-seven".