643752617407 has 8 divisors (see below), whose sum is σ = 653375860992. Its totient is φ = 634129815000.

The previous prime is 643752617381. The next prime is 643752617413. The reversal of 643752617407 is 704716257346.

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 643752617407 - 2⁷ = 643752617279 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 (643752617437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3924282 + ... + 4085032.

It is an arithmetic number, because the mean of its divisors is an integer number (81671982624).

Almost surely, 2^643752617407 is an apocalyptic number.

643752617407 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

643752617407 is a deficient number, since it is larger than the sum of its proper divisors (9623243585).

643752617407 is a wasteful number, since it uses less digits than its factorization.

643752617407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220589.

The product of its (nonzero) digits is 5927040, while the sum is 52.

The spelling of 643752617407 in words is "six hundred forty-three billion, seven hundred fifty-two million, six hundred seventeen thousand, four hundred seven".