721642859443 has 8 divisors (see below), whose sum is σ = 787291750080. Its totient is φ = 656001467880.

The previous prime is 721642859429. The next prime is 721642859491. The reversal of 721642859443 is 344958246127.

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

It is a de Polignac number, because none of the positive numbers 2^k-721642859443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721642859143) 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, 1672605 + ... + 2059342.

It is an arithmetic number, because the mean of its divisors is an integer number (98411468760).

Almost surely, 2^721642859443 is an apocalyptic number.

721642859443 is a deficient number, since it is larger than the sum of its proper divisors (65648890637).

721642859443 is a wasteful number, since it uses less digits than its factorization.

721642859443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749537.

The product of its digits is 11612160, while the sum is 55.

The spelling of 721642859443 in words is "seven hundred twenty-one billion, six hundred forty-two million, eight hundred fifty-nine thousand, four hundred forty-three".