721753541871 has 16 divisors (see below), whose sum is σ = 1031318813184. Its totient is φ = 447809481504.

The previous prime is 721753541807. The next prime is 721753541879. The reversal of 721753541871 is 178145357127.

It is a happy number.

It is not a de Polignac number, because 721753541871 - 2⁶ = 721753541807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721753541879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141351451 + ... + 141356556.

It is an arithmetic number, because the mean of its divisors is an integer number (64457425824).

Almost surely, 2^721753541871 is an apocalyptic number.

721753541871 is a deficient number, since it is larger than the sum of its proper divisors (309565271313).

721753541871 is a wasteful number, since it uses less digits than its factorization.

721753541871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282708070.

The product of its digits is 1646400, while the sum is 51.

Adding to 721753541871 its reverse (178145357127), we get a palindrome (899898898998).

The spelling of 721753541871 in words is "seven hundred twenty-one billion, seven hundred fifty-three million, five hundred forty-one thousand, eight hundred seventy-one".