721751247220160 has 28 divisors (see below), whose sum is σ = 1718670157443768. Its totient is φ = 288700498887936.

The previous prime is 721751247220141. The next prime is 721751247220163. The reversal of 721751247220160 is 61022742157127.

721751247220160 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721751247220163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127736323462 + ... + 1127736324101.

Almost surely, 2^{721751247220160} is an apocalyptic number.

It is an amenable number.

721751247220160 is an abundant number, since it is smaller than the sum of its proper divisors (996918910223608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721751247220160 is a wasteful number, since it uses less digits than its factorization.

721751247220160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255472647580 (or 2255472647570 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 47.

Adding to 721751247220160 its reverse (61022742157127), we get a palindrome (782773989377287).

The spelling of 721751247220160 in words is "seven hundred twenty-one trillion, seven hundred fifty-one billion, two hundred forty-seven million, two hundred twenty thousand, one hundred sixty".