643309629573887 has 8 divisors (see below), whose sum is σ = 681154476011856. Its totient is φ = 605465127971712.

The previous prime is 643309629573839. The next prime is 643309629573907. The reversal of 643309629573887 is 788375926903346.

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

It is a cyclic number.

It is not a de Polignac number, because 643309629573887 - 2²² = 643309625379583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643309629573187) 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, 82363193 + ... + 89834930.

It is an arithmetic number, because the mean of its divisors is an integer number (85144309501482).

Almost surely, 2^{643309629573887} is an apocalyptic number.

643309629573887 is a deficient number, since it is larger than the sum of its proper divisors (37844846437969).

643309629573887 is a wasteful number, since it uses less digits than its factorization.

643309629573887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172417897.

The product of its (nonzero) digits is 9876142080, while the sum is 80.

The spelling of 643309629573887 in words is "six hundred forty-three trillion, three hundred nine billion, six hundred twenty-nine million, five hundred seventy-three thousand, eight hundred eighty-seven".